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• What precautions should I take once defective RAM has been replaced?

  - by DustByte

  I recently discovered that my RAM is faulty (MemTest86+). I am waiting for new RAM to be sent to me.  It was through sheer luck that I discovered something was wrong. I was copying a large amount of big files and decided to verify the copies by their checksums. I discovered strange discrepancies, and noticed that checksum computation for the same file was not consistent. Now, this is the only problem I have encountered; no BSOD, no crashes, no errors. In a sense this makes me more worried than if I would have had massive crashes. I have no idea for how long the RAM has been faulty, and I have no idea if corrupt bits have been saved into files on my hard drives. I do know the RAM was fine two months ago (tested it back then). I am a user of Adobe's Lightroom and I am worried that photos or the catalog itself could carry corrupt data. Question: what should I do once new healthy RAM has been installed? Reinstall Windows (I'm using Windows 7, 64 bit)? Is there a risk that I will be presented with nasty surprises in the future if I don't? What about personal files? I have backups of some of the files but for newer files I'm not sure I can even trust the backups. It's going to take me many hard hours to manually replace files with older versions, or compare checksums.

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• Send keystrokes simultaneously to both host and slave over internet?

  - by donodarazao

  I would like to watch movies with a friend who lives far away from me. For this, the playback should be synchronized on both our pc. However, we have some constraints: Due to our low bandwidth internet, any form of streaming solution wouldn't work. We do however both have the same copy of the movie on our harddisks. We use movies to learn languages and because of this, we very frequently pause and rewind. The typical "3...2...1...go!" solution over skype wouldn't work because it would soon get out of sync. I imagine an approach that sends keystrokes simultaneously to both our pc would work (for example, if I press space to pause the movie at my pc, space should also be send to his pc). Any ideas how this could be realized? I looked into Synergy and InputDirector, but both neither seem to be an option, because I don't want to see the desktop of my friend, I want to see my desktop Keystrokes should be sent simultaneously to both pc, not just to one pc We have both Windows 7x64, and we might use any media player (VLC, XBMC,...).

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• Share Firefox/Thnderbird data between W7 and Linux Mint 12 in dual boot computer

  - by Albert

  I've just set up my laptop (where I had running only W7) with a dual boot to run Linux Mint 12 as well. I have a "Data" partition (apart from the required partitions for W7 and Linux) where I store pretty much everything that isn't software installations (music, videos, project files, etc). I seem to be able to access that NTFS partition totally fine from Mint (like I've always done with W7), which is cool because I can access all that stuff regardless of which OS I'm using. I would like to know if it's possible (and how) to go one step further and share programs data between the two OS. One example would be my Firefox and Thunderbird data. For example, in Firefox share my bookmarks (and if I could share history, autocomplete and all that stuff, that would be awesome). In thunderbird, be able to share my mail and configuration, seeing the same inbox, folders, message rules, etc... So if I receive/send an email from W7 and later switch to Mint, I can see that email as it had been received/sent from Mint, and vice versa. Is this even possible? Or am I asking for too much convenience? If it's possible, any clues on how to set it all up?

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• Show full URI/URL in Chrome's developer tools Network tab

  - by Lev

  When using Chrome to debug, I find it incredibly difficult to be efficient due to the fact that I don't see how I can force the "Network" tab of the developer tools to show the full request URI. It will show the full URI if you hover the link and wait a second, but this is incredibly counterproductive. All of my AJAX requests are sent to ajax.php, and handled by using query string arguments, like: ajax.php?do=profile-set ajax.php?do=game-save ... etc. Since I use AJAX extensively, my network tab is filled with "ajax.php", but I have to manually hover each and every entry to find the request I am looking for. Surely there has got to be another way!? I am constantly fed up by something new in Firefox and immediately force myself back into Chrome, but it is always the developer tools in Chrome that keep me from using it for an extended period of time. Hopefully I can find out how to do this so I can continue using Chrome as my numero uno. I've provided a screen shot to show you where I mean:

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• Route through site-to-site VPN not working

  - by Jonathan

  I'm trying to set up a site-to-site VPN using RRAS on two 2K8r2 servers since yesterday. The connection is working at this point, but I can't get it to send traffic from one site to the other one. Set up: the set up is the same on both sites: the server is connected to a router that's connected to a modem. The routers act like a DHCP-server and assign IP addresses from the range subnet.21-subnet-.100. Both servers use a static IP address, subnet.11, and are set up as DMZ. Configuration: the servers are configured using the wizard to set up a site-to-site connection. This works with a demand-dial interface and a PPTP VPN connection. As mentioned, the VPN connection work properly. Problem: I can't get the servers to send the traffic for the other site, to be sent through the VPN connection. I added a static route on both server (home, office 1) and I can see the result in the IP routing table (home, office 1). I did this because the route didn't show up automatically. My guess is that this last step isn't right, for example because the routing table states "non demand-dial", which seems not correct. Home: Subnet: 10.0.1.0/24 Router: 10.0.1.1 Server: 10.0.1.11 (DMZ) DHCP: 10.0.1.21-10.0.1.100 RRAS DHCP: 10.0.1.101-10.0.1.150 Office 1: Subnet: 10.0.2.0/24 Router: 10.0.2.1 Server: 10.0.2.11 (DMZ) DHCP: 10.0.2.21-10.0.2.100 RRAS DHCP: 10.0.2.101-10.0.2.150 I hope someone has an idea to get this route working!

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• SMTP message rate control on Ubuntu 8.04, preferably with postfix

  - by TimDaMan

  Maybe I am chasing a bug but I am trying to set up a smtp proxy of sorts. I have a postfix server which receives all the email for a collection of servers/clients. It them uses a smarthost (relayhost=...) to forward it's mail to our corporate MTA. I would like to limit the number of messages an individual server can relay to prevent swamping the corporate MTA. Postfix has a program called "anvil" that is capable of tracking stats about mail to be used for such things but it doesn't seem to be executed. I ran "inotifywait -m /usr/lib/postfix/anvil" while I started postfix and sent a number of messages through it from a remote server. inotifywait indicated anvil was never run. Anyone gotten postfix/anvil rate controls to work? main.cf smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no append_dot_mydomain = no readme_directory = no myhostname = site-server-q9 alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = localhost relayhost = Out outgoing mail relay mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 10.0.0.0/8 mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = 10.X.X.X smtpd_client_message_rate_limit = 1 anvil_rate_time_unit = 1h master.cf extract anvil unix - - - - 1 anvil smtp inet n - - - - smtpd

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• Centos/Postfix able to send mail but not receive it

  - by Dan Hastings

  I have set up postfix and used the mail command to test and an email was successfully sent and delivered. The email arrived in my yahoo inbox BUT the sender also recieved an email in the Maildir directory saying "I'm sorry to have to inform you that your message could not be delivered to one or more recipients", even though the message was delivered. I tried replying from yahoo to the email but it never arrived. I have 1 MX record added to godaddy which i did last week. Priority0 Host @ Points to mail.domain.com TTL1 Hour Postfix main.cf has the following added to it myhostname = mail.domain.com mydomain = domain.com myorigin = $mydomain inet_interfaces = all mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain mynetworks = 192.168.0.0/24, 127.0.0.0/8 relay_domains = home_mailbox = Maildir/ I checked var/logs/maillog and found the following errors occuring postfix/anvil[18714]: statistics: max connection rate 1/60s for (smtp:unknown) at Jun 3 09:30:15 postfix/anvil[18714]: statistics: max connection count 1 for (smtp:unknown) at Jun 3 09:30:15 postfix/anvil[18714]: statistics: max cache size 1 at Jun 3 09:30:15 postfix/smtpd[18772]: connect from unknown[unknown] postfix/smtpd[18772]: lost connection after CONNECT from unknown[unknown] postfix/smtpd[18772]: disconnect from unknown[unknown] output of postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 2 home_mailbox = Maildir/ html_directory = no inet_interfaces = all inet_protocols = all mail_owner = postfix mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain mydomain = domain.com myhostname = mail.domain.com mynetworks = 168.100.189.0/28, 127.0.0.0/8 myorigin = $mydomain newaliases_path = /usr/bin/newaliases.postfix queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES relay_domains = sample_directory = /usr/share/doc/postfix-2.6.6/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop unknown_local_recipient_reject_code = 550

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• Vyatta internet connection + hosted site on same IP

  - by boburob

  Having a small issue setting up a vyatta. The company internet and two different websites are both on the same IP. Server 1 - Has websites hosted on ports 1000 and 3000 and also has a proxy server installed to provide internet connection to the domain Server 2 - Has a website hosted on ports 80 and 433 The vyatta is correctly natting the appropriate traffic to each server, and allowing the proxy to get internet traffic, however I have a problem getting to the websites hosted on these two servers inside the domain. I believe the problem is that the HTTP request is being sent with an IP, eg: 12.34.56.78. The request will reach the website and the server will attempt to send the request back to the IP, however this is the IP of the Vyatta, so it has nowhere else to go. I thought the solution would be something like this: rule 50 { destination { address 12.34.56.78 port 1000 } inbound-interface eth1 inside-address { address 10.19.2.3 } protocol tcp type destination } But this doesnt seem to do it! UPDATE I changed the rules to the following: rule 50 { destination { address 12.34.56.78 port 443 } outbound-interface eth1 protocol tcp source { address 10.19.2.3 } type masquerade } rule 51 { destination { address 12.34.56.78 port 443 } inbound-interface eth1 inside-address { address 10.19.2.2 } protocol tcp type destination } I am now seeing traffic going between the two with Wireshark, but the website will still fail to load.

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• Cisco Access switch is dropping large amount of end points

  - by user135458

  This afternoon, with no changes to the network, a switch suddenly started dropping off lots of connections. These connections would come back up a few minutes later, then another area connected to the switch would drop off. This is an older 4006 chassis switch which could in and of itself be a problem but I'm looking to see what else you all would look for in trying to find a root cause. Switch is connected via ports 1/1 and 1/2 in an etherchannel to a VSS core 1/1/42 and 2/1/42. Both sides are up and working however the CPU on the switch will spike up to 99% and that's when CRC errors start to hit the VSS core on one of those interfaces and end points start dropping off. We tried new transceivers and SFP's on each side of the link, same result. When we tried swapping the fiber patch cables on the access switch the CRC errors did not follow the fiber cables they stayed with port 1/2 on the access switch. So port 1/2 on the supervisor module looks like the culprit. We actually tried to create a new member of the ethernet channel by taking a fiber media converter to cat5 and make that a member of the port-channel but when we plugged it in you couldn't even reach the switch. I'm guessing that's unrelated and a problem with the media converter. As of right now we have left it in a state of only one fiber cable running to one side of the VSS core (1/1 Access Switch -- 2/1/42). I've sent some info into TAC and they are looking into the situation but does anyone else have any commands I could run or some troubleshooting I could look into in the meantime?

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• why i cannot download jdk from oracle web site directly without AuthParam?

  - by hugemeow

  that is download with the following command, why it fails to download that file? wget http://download.oracle.com/otn-pub/java/jdk/6u35-b10/jdk-6u35-linux-i586.bin the following command works, but that AuthParam may not work after a while, why? wget http://download.oracle.com/otn-pub/java/jdk/6u35-b10/jdk-6u35-linux-i586.bin?AuthParam=1346955572_27e44512fe8ef5cb920c4c329e5f0fd8 how this AuthParam option is implemented? why i cannot download without this parameter? and why i can only get this parameter using explorer? is rewrite used in the oracle server when deal with wget request? why the same command not works after an hour, does the value of AuthParam expired? so how the server check whether the value of AuthParam is expired? wget http://download.oracle.com/otn-pub/java/jdk/6u35-b10/jdk-6u35-linux-i586.bin?AuthParam=1346955572_27e44512fe8ef5cb920c4c329e5f0fd8 --2012-09-07 03:51:01-- http://download.oracle.com/otn-pub/java/jdk/6u35-b10/jdk-6u35-linux-i586.bin?AuthParam=1346955572_27e44512fe8ef5cb920c4c329e5f0fd8 Resolving download.oracle.com... 23.67.251.50, 23.67.251.57 Connecting to download.oracle.com|23.67.251.50|:80... connected. HTTP request sent, awaiting response... 403 Forbidden 2012-09-07 03:51:01 ERROR 403: Forbidden. @KJ-SRS is that kind of CGI program which is used to judge if AuthParam is right? is that possible to download jdk package purely using wget command, and no need to get that AuthParam in explorer

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• IIS SMTP server (Installed on local server) in parallel to Google Apps

  - by shaharru

  I am currently using free version of Google Apps for hosting my email.It works great for my official mails my email on Google is [email protected]. In addition I'm sending out high volume mails (registrations, forgotten passwords, newsletters etc) from the website (www.mydomain.com) using IIS SMTP installed on my windows machine. These emails are sent from [email protected] My problem is that when I send email from the website using IIS SMTP to a mail address [email protected] I don’t receive the email to Google apps. (I only receive these emails if I install a pop service on the server with the [email protected] email box). It seems that the IIS SMTP is ignoring the domain MX records and just delivers these emails to my local server. Here are my DNS records for domain.com: mydomain.com A 82.80.200.20 3600s mydomain.com TXT v=spf1 ip4: 82.80.200.20 a mx ptr include:aspmx.googlemail.com ~all mydomain.com MX preference: 10 exchange: aspmx2.googlemail.com 3600s mydomain.com MX preference: 10 exchange: aspmx3.googlemail.com 3600s mydomain.com MX preference: 10 exchange: aspmx4.googlemail.com 3600s mydomain.com MX preference: 10 exchange: aspmx5.googlemail.com 3600s mydomain.com MX preference: 1 exchange: aspmx.l.google.com 3600s mydomain.com MX preference: 5 exchange: alt1.aspmx.l.google.com 3600s mydomain.com MX preference: 5 exchange: alt2.aspmx.l.google.com 3600s Please help! Thanks.

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• Western Digital My Book not recognized by WD software

  - by Kari

  A few years ago I bought a WD My Book Pro 2. It worked fine for a while, then one of the drives failed and I sent it back to be replaced under warranty. I never got around to setting up the new one when I got it back. I finally ran out of room on my internal drive, so I tried to use the external - no go. Both drives spin up, but aren't recognized by either Disk Utility (Mac) or the WD Drive Manager. I tried on a PC as well with fresh software. Then I pulled the drives out of the enclosure (warranty is already expired) and plugged them straight into the PC. Both recognized and working 100% in RAID0. BIOS recognizes either disk as functional; Windows only sees them when both are connected due to the RAID which I can't change without the WD software. The drives that were returned to me are the "Green" drives which I've read are NOT recommended for RAID. Is it possible that this is interfering with them reading externally? Any other ideas? My main computer is a laptop so using them internally isn't an option :(

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• Is there a tool that can test what SSL/TLS cipher suites a particular website offers?

  - by Jeremy Powell

  Is there a tool that can test what SSL/TLS cipher suites a particular website offers? I've tried openssl, but if you examine the output: $ echo -n | openssl s_client -connect www.google.com:443 CONNECTED(00000003) depth=1 /C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA verify error:num=20:unable to get local issuer certificate verify return:0 --- Certificate chain 0 s:/C=US/ST=California/L=Mountain View/O=Google Inc/CN=www.google.com i:/C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA 1 s:/C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA i:/C=US/O=VeriSign, Inc./OU=Class 3 Public Primary Certification Authority --- Server certificate -----BEGIN CERTIFICATE----- MIIDITCCAoqgAwIBAgIQL9+89q6RUm0PmqPfQDQ+mjANBgkqhkiG9w0BAQUFADBM MQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkg THRkLjEWMBQGA1UEAxMNVGhhd3RlIFNHQyBDQTAeFw0wOTEyMTgwMDAwMDBaFw0x MTEyMTgyMzU5NTlaMGgxCzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpDYWxpZm9ybmlh MRYwFAYDVQQHFA1Nb3VudGFpbiBWaWV3MRMwEQYDVQQKFApHb29nbGUgSW5jMRcw FQYDVQQDFA53d3cuZ29vZ2xlLmNvbTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkC gYEA6PmGD5D6htffvXImttdEAoN4c9kCKO+IRTn7EOh8rqk41XXGOOsKFQebg+jN gtXj9xVoRaELGYW84u+E593y17iYwqG7tcFR39SDAqc9BkJb4SLD3muFXxzW2k6L 05vuuWciKh0R73mkszeK9P4Y/bz5RiNQl/Os/CRGK1w7t0UCAwEAAaOB5zCB5DAM BgNVHRMBAf8EAjAAMDYGA1UdHwQvMC0wK6ApoCeGJWh0dHA6Ly9jcmwudGhhd3Rl LmNvbS9UaGF3dGVTR0NDQS5jcmwwKAYDVR0lBCEwHwYIKwYBBQUHAwEGCCsGAQUF BwMCBglghkgBhvhCBAEwcgYIKwYBBQUHAQEEZjBkMCIGCCsGAQUFBzABhhZodHRw Oi8vb2NzcC50aGF3dGUuY29tMD4GCCsGAQUFBzAChjJodHRwOi8vd3d3LnRoYXd0 ZS5jb20vcmVwb3NpdG9yeS9UaGF3dGVfU0dDX0NBLmNydDANBgkqhkiG9w0BAQUF AAOBgQCfQ89bxFApsb/isJr/aiEdLRLDLE5a+RLizrmCUi3nHX4adpaQedEkUjh5 u2ONgJd8IyAPkU0Wueru9G2Jysa9zCRo1kNbzipYvzwY4OA8Ys+WAi0oR1A04Se6 z5nRUP8pJcA2NhUzUnC+MY+f6H/nEQyNv4SgQhqAibAxWEEHXw== -----END CERTIFICATE----- subject=/C=US/ST=California/L=Mountain View/O=Google Inc/CN=www.google.com issuer=/C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA --- No client certificate CA names sent --- SSL handshake has read 1777 bytes and written 316 bytes --- New, TLSv1/SSLv3, Cipher is AES256-SHA Server public key is 1024 bit Compression: NONE Expansion: NONE SSL-Session: Protocol : TLSv1 Cipher : AES256-SHA Session-ID: 748E2B5FEFF9EA065DA2F04A06FBF456502F3E64DF1B4FF054F54817C473270C Session-ID-ctx: Master-Key: C4284AE7D76421F782A822B3780FA9677A726A25E1258160CA30D346D65C5F4049DA3D10A41F3FA4816DD9606197FAE5 Key-Arg : None Start Time: 1266259321 Timeout : 300 (sec) Verify return code: 20 (unable to get local issuer certificate) --- it just shows that the cipher suite is something with AES256-SHA. I know I could grep through the hex dump of the conversation, but I was hoping for something a little more elegant. I would prefer Linux tools, but Windows (or other) would be fine. This question is motivated by the security testing I do for PCI and general penetration testing. Update: GregS points out below that the SSL server picks from the cipher suites of the client. So it seems I would need to test all cipher suites one at a time. I think I can hack something together, but is there a tool that does particularly this?

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• Transparent proxying leaves sockets with SYN_RCVD in MacOS X 10.6 Snow Leopard (and maybe FreeBSD)

  - by apenwarr

  I'm trying to create a transparent proxy on my MacOS machine in order to port the sshuttle ssh-based transproxy VPN from Linux. I think I almost have it working, but sadly, almost is not 100%. Short version is this. In one window, start something that listens on port 12300: $ while :; do nc -l 12300; done Now enable proxying: # sysctl -w net.inet.ip.forwarding=1 # sysctl -w net.inet.ip.fw.enable=1 # ipfw add 1000 fwd 127.0.0.1,12300 log tcp from any to any And now test it out: $ telnet localhost 9999 # any port number will do # this works; type stuff and you'll see it in the nc window $ telnet google.com 80 # any host/port will do # this *doesn't* work! After the latter experiment, I see lines like this in netstat: $ netstat -tn | grep ^tcp4 tcp4 0 0 66.249.91.104.80 192.168.1.130.61072 SYN_RCVD tcp4 0 0 192.168.1.130.61072 66.249.91.104.80 SYN_SENT The second socket belongs to my telnet program; the first is more suspicious. SYN_RCVD implies that my SYN packet was correctly captured by the firewall and taken in by the kernel, but apparently the SYNACK was never sent back to telnet, because it's still in SYN_SENT. On the other hand, if I kill the nc server, I get this: $ telnet google.com 80 Trying 66.249.81.104... telnet: connect to address 66.249.81.104: Connection refused telnet: Unable to connect to remote host ...which is as expected: my proxy server isn't running, so ipfw redirects my connection to port 12300, which has nobody listening on it, ie. connection refused. My uname says this: $ uname -a Darwin mean.local 10.2.0 Darwin Kernel Version 10.2.0: Tue Nov 3 10:37:10 PST 2009; root:xnu-1486.2.11~1/RELEASE_I386 i386 Does anybody see any different results? (I'm especially interested in Snow Leopard vs Leopard results, as there seem to be some internet rumours that transproxy is broken in Snow Leopard version) Any advice for how to fix?

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• IPv6 working fine, IPv4 throws OpenSSL error

  - by jippie

  I am building a webserver ( http://blog.linformatronics.nl/ ), which functions just fine on both IPv4 and IPv6 and when using a non-SSL connection. However when I connect to it through https, IPv6 works as expected, but an IPv4 connection throws a client side error. Server side logs are empty for the IPv4/https connection. Summarized in a table: | http | https -----+-------+------------------------------------------------------- IPv4 | works | OpenSSL error, failed. No server side logging. -----+-------+------------------------------------------------------- IPv6 | works | self signed certificate warning, but works as expected Apparently the SSL tunnel isn't even set up, which accounts for the Apache logs being empty. But why does it work fine for IPv6 and fail for IPv4? My question is why is this OpenSSL error being thrown and how can I solve it? Below is some extra information about the setup. IPv6 https Command used to reproduce IPv6/https behaviour: $ wget --no-check-certificate -O /dev/null -6 https://blog.linformatronics.nl --2012-11-03 15:46:48-- https://blog.linformatronics.nl/ Resolving blog.linformatronics.nl (blog.linformatronics.nl)... 2001:980:1b7f:1:a00:27ff:fea6:a2e7 Connecting to blog.linformatronics.nl (blog.linformatronics.nl)|2001:980:1b7f:1:a00:27ff:fea6:a2e7|:443... connected. WARNING: cannot verify blog.linformatronics.nl's certificate, issued by `/CN=localhost': Self-signed certificate encountered. WARNING: certificate common name `localhost' doesn't match requested host name `blog.linformatronics.nl'. HTTP request sent, awaiting response... 200 OK Length: 4556 (4.4K) [text/html] Saving to: `/dev/null' 100%[=======================================================================>] 4,556 --.-K/s in 0s 2012-11-03 15:46:49 (62.5 MB/s) - `/dev/null' saved [4556/4556] IPv4 https Command used to reproduce IPv6/https behaviour: $ wget --no-check-certificate -O /dev/null -4 https://blog.linformatronics.nl --2012-11-03 15:47:28-- https://blog.linformatronics.nl/ Resolving blog.linformatronics.nl (blog.linformatronics.nl)... 82.95.251.247 Connecting to blog.linformatronics.nl (blog.linformatronics.nl)|82.95.251.247|:443... connected. OpenSSL: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol Unable to establish SSL connection. Notes I am on Ubuntu Server 12.04.1 LTS

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• Exim: send every emails with a predefined sender

  - by Gregory MOUSSAT

  We use Exim on our servers to send emails only from local automated users, as root, cron, etc. We have to specify every possible users into /etc/email-addresses. For example: root: [email protected] cron: [email protected] backup: [email protected] This allow us te receive every email generated. The problem is when we add a user for whatever reason (for example when we add a package, some add a user), we can forget to add this user to /etc/email-addresses. Most of the time it's not a problem, but this is not clean. And the overall method is not clean. We'd like to configure Exim to send every emails with the same source address. i.e. every sent email comes from [email protected] One way could be to use a wildcard or a regular expression into /etc/email-addresses but this is not supported. I don't currently understand Exim enought to figure out how to modify this in a way or another. Ideally, Exim should look into /etc/email-addresses first, and if no match it use the predefined address. But this is very secondary. There are two places where this address is used: 1. when Exim send the FROM: command to the smtp server 2. inside the header edit: The rewrite section is the original one from Debian begin rewrite .ifndef NO_EAA_REWRITE_REWRITE *@+local_domains "${lookup{${local_part}}lsearch{/etc/email-addresses} \ {$value}fail}" Ffrs *@ETC_MAILNAME "${lookup{${local_part}}lsearch{/etc/email-addresses} \ {$value}fail}" Ffrs .endif (comments removed)

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• IPtables - Accept Arbitrary Packets

  - by Asad Moeen

  I've achieved a lot on blocking attacks on GameServers but I'm stuck on something. I've blocked major requests of game-server which it aceepts in the form "\xff\xff\xff\xff" which can be followed by the actual queries like get status or get info to make something like "\xff\xff\xff\xff getstatus " but I see other queries if sent to the game-server will cause it to reply with a "disconnect" packet with the same rate as input so if the input rate is high then the high output of "disconnect" might give lag to the server. Hence I want to block all queries except the ones actual clients use which I suppose are in the form "\xff\xff\xff\xff" or .... so, I tried using this rule : -A INPUT -p udp -m udp -m u32 ! --u32 0x1c=0xffffffff -j ACCEPT -A INPUT -p udp -m udp -m recent --set --name Total --rsource -A INPUT -p udp -m udp -m recent --update --seconds 1 --hitcount 20 --name Total --rsource -j DROP Now where the rule does accept the clients but it only blocks requests in the form "\xff\xff\xff\xff getstatus " ( by which GameServer replies with status ) and not just "getstatus " ( by which GameServer replies with disconnect packet ). So I suppose the accept rule is accepting the simple "string" as well. I actually want it to also block the non-(\xff) queries. So how do I modify the rule?

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• Building an Email server for mass emails

  - by EGHDK

  I recently started doing IT odd jobs for a company. The company has a pretty decent sized mail list that costs them over $3000 per month to send out email from. The company is set on creating their own email server so that it can just run and send emails to the client lists. They only send out emails roughly once a month. Has anyone had experience with this? This wouldn't be an email server I guess (as it doesn't need to handle incoming messages) It just has to be able to send around 200,000 emails, once a month. What would be the best way to go about this? Services online like MailChimp have proved to be too pricey. It's not an ad that is being sent out, it's more of a monthly newsletter, so we don't need any crazy software for ROI or anything crazy like that. If I could fit 200,000 people in GMAIL, I'd do it, but I don't think I can (heh... maybe I should try).

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• Solaris 10 invalid ARP requests from 0.0.0.0? Link up/down every hour or 2

  - by JWD

  The guys at the data center where I'm hosting a server running Solaris 10 are telling me that my server is making a lot of invalid arp requests. This is an example of a portion of what was sent to me from the logs (with Mac addresses and IP addresses changed). [mymacaddress]/0.0.0.0/0000.0000.0000/[myipaddress]/[Datestamp]) It's being logged every hour. I don't see anything in the arp tables (arp -a) or routing tables (netstat -r) and I don't see anything relating to 0.0.0.0 when snoping the arp requests. The only place I see any reference to 0.0.0.0 is if I do netstat -a for the SCTP SCTP: Local Address Remote Address Swind Send-Q Rwind Recv-Q StrsI/O State ------------------------------- ------------------------------- ------ ------ ------ ------ ------- ----------- 0.0.0.0 0.0.0.0 0 0 102400 0 32/32 CLOSED But not really sure what that means. Doesn't seem like I can disable SCTP. There are some tunable SCTP parameters but it's not something I'm familiar with. Do I have to add changes to /etc/system? Looks like sctp_heartbeat_interval might be what I need to change? If it makes any difference, I have a few solaris zones running on this server, each with their own IP address on a virtual interface. eth0:0, eth0:1, etc. Does anyone have any idea what might be causing this and how to stop it? I think the switch I'm connected to doesn't like it and momentarily drops the connection. Is there anyway to at least block those requests using ipfilter or something else? Update: This was happening more frequently but now it seems to be happening roughly every hour or every two hours. It's not consistent. I tried setting setting the link speed and duplex to match the switch port and that seemed to make it stop happening for a few hours but then it started again.

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• What is the sysadmin's dream network printer? 6-8k pg/mo. Xerox, OkiData, Lexmark and HP are all fail

  - by Jacob

  How do I find out what printer brand and/or type doesn't suck? This information is hard to find and manufacturer's websites won't reveal any issues with certain printers. After 10 years of dealing with network shared printers, I can't say that I have been impressed with any of the printer brands I've seen. Brother's little laser MFPs have been close to ideal for low volume, but that is it, period. OkiData, Lexmark, HP, Xerox solid ink printers, they all sucked in one way or another. Currently I'm looking to replace a Xerox ColorQube 8570 because it fails to print on a regular basis. Sometimes it doesn't even boot VxWorks fully - it just hangs at 2% or whatever. I've used Xerox 8860MFPs and they sucked just as bad. I won't talk about ink jets here, that's most likely not what I'm looking for. We currently spend about $4k on paper and ink per year for this printer at up to 6-8k pages per month, letter, mostly black and white, low color usage. I want the printer to feed paper correctly, not crash and burn when a PDF isn't according to its taste (my favorite Xerox problem here) and with decent drivers for Windows and OS X. Print quality is not of the utmost importance but paper does get sent to customers.

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• How do I identify Blackberry / OWA users in my IIS logs?

  - by Quinten

  We just rolled out a Blackberry Express Server, and would like to make sure that all Blackberry devices that our users own are connecting SOLELY through the BES server. We are running Exchange 2010 SP1. I've read some links that discuss blocking BIS at the firewall level. Before doing that, however, I'd like to individually contact all users with Blackberries and make sure that they have a chance to switch to the BES server. I've sent a company-wide email, but unsurprisingly folks tend to tune these out until they are forced into action. Is there an easy way to identify the users with Blackberries by searching IIS logs, or perhaps using the Exchange Management Shell? Especially some automated way? I've tried searching for the Blackberry identifier, but it does not appear next to any user name, so it's not as helpful as it could be. Edit: to clarify, what I'm talking about is the fact that Blackberries can use OWA to download mail to the phone. We do not allow IMAP or POP access through our firewall so that's not a concern--just folks with Blackberries using Blackberry's hack to allow it to connect to Exchange without a BES server. As far as I know, Blackberries are the only popular phones that use this method to download mail.

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• Small TCP Window on WAN between 2 Locations

  - by Brent

  Site A: Denver datacenter. 60MBPS. Site B: Chicago. 100MBPS. ICMP pings: Packets: Sent = 176, Received = 176, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 74ms, Maximum = 94ms, Average = 75ms File transfer between sites that never goes past ~7MBPS: Windows Update download at 60MBPS+: Site to site: IPSec VPN using two Cisco 5520's. CPU at 3-4% and lots of memory to spare. The latency between to two sites is very acceptable so I can't see an issue why it is performing so slow when transferring between the two sites. I have found that any type of transfer (FTP, HTTP, Windows file shares) will never go above ~7MBPS. When the WAN was first setup, I was able to get transfers at 50-60MBPS, which is what is expected due to the WAN connection at the Site A at 60MBPS. Then a few days later, I was not able to get anything going faster than ~7MBPS. Is there a upstream router between Denver and Chicago causing this? I want to take the blame away from our setup as downloads from Windows Update go blazing fast and for the first few days after the site to site VPN came up, I was transferring VM images at 50-60MBPS. Our stack: HP P2000 MSA - HP C7000 Chassis - HP Flex-10 - Cisco Gigabit switch - Cisco ASA - WAN

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• Is there a keyboard shortcut to open a mounted TrueCrypt container?

  - by Lernkurve

  Problem I would like to open a mounted TrueCrypt container with a keyboard shortcut. Currently, I'm opening it by double-clicking the volume. See screenshot above. Instead of using the mouse, I'd like to use the keyboard. But there seems to be no way. Versions TrueCrypt 7.1.a Windows 7 64bit Failed attempts When you right-click on the volume, there is a "Open" command in the context menu. So, I've tried to open the context menu with the context menu key on the Windows keyboard. But strangely enough that does not open the context menu. I've also tried Shift+F10 to open the context menu, but that does not work either. There is no "Open" command in the menues (Volume, System, Favorites, Tools, Settings, Help), so I can't press for instance Alt+V to open a menu and go from there. I tried to use AutoHotKey to send a double-click command, but that does not work because the double-click is sent to the current mouse position and not the current selection, which would my selected TrueCrypt volume. There would be a HotKeys dialog in menu Settings Hot Keys... But there seems to be no way, to add or configure a hotkey for "Open". Workaround My current workaround is to tick "Open Explorer window for successfully mounted volume" in the menu Settings Preferences...

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• Is TortoiseSVN really this buggy?

  - by John Isaacks

  I have been using tortoise svn for a couple weeks now. I get errors very often. Almost everything I do creates an error. this is with repositories on the internet, locally on my machine or a machine on the network. So I started to keep track. Some examples are below. 12/31/2010 Can't move 'C:\Users\jisaacks\Desktop\my branch test.svn\tmp\entries' to 'C:\Users\jisaacks\Desktop\my branch test.svn\entries': The file or directory is corrupted and unreadable. 01/04/2011 Commit failed (details follow): Server sent unexpected return value (405 Method Not Allowed) in response to MKCOL request for '/svn/kranichs-svn/!svn/wrk/b316f15e-0869-4644-9c53-87aa0103506b/branches' 01/06/2011 Can't move 'C:\Users\jisaacks\Desktop\DVD Catalog\vendors.svn\tmp\entries' to 'C:\Users\jisaacks\Desktop\DVD Catalog\vendors.svn\entries': The file or directory is corrupted and unreadable. 01/06/2011 Can't move 'C:\Users\jisaacks\Desktop\DVD Catalog\cake\tests\test_app\views\layouts.svn\tmp\entries' to 'C:\Users\jisaacks\Desktop\DVD Catalog\cake\tests\test_app\views\layouts.svn\entries': The file or directory is corrupted and unreadable. 01/06/2011 Commit failed (details follow): attempt to write a readonly database attempt to write a readonly database That last one about the read only database happens every time I commit. Say if I am working on the head revision (7) in a working copy. I make a change and commit it. It gives me this error. But if I look at the log it tells me that there is now a revision 8 (the commit I just made) but I am still on revision 7. So I need to run update to be on the current revision that I just commited. I hope I explained that clearly. Anyways with all these errors I wonder.. Is TSVN just this unstable, does everyone have these issues. Or is it just me? If just me, what could I be doing wrong?

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• Understanding tcptraceroute versus http response

  - by kojiro

  I'm debugging a web server that has a very high wait time before responding. The server itself is quite fast and has no load, so I strongly suspect a network problem. Basically, I make a web request: wget -O/dev/null http://hostname/ --2013-10-18 11:03:08-- http://hostname/ Resolving hostname... 10.9.211.129 Connecting to hostname|10.9.211.129|:80... connected. HTTP request sent, awaiting response... 200 OK Length: unspecified [text/html] Saving to: ‘/dev/null’ 2013-10-18 11:04:11 (88.0 KB/s) - ‘/dev/null’ saved [13641] So you see it took about a minute to give me the page, but it does give it to me with a 200 response. So I try a tcptraceroute to see what's up: $ sudo tcptraceroute hostname 80 Password: Selected device en2, address 192.168.113.74, port 54699 for outgoing packets Tracing the path to hostname (10.9.211.129) on TCP port 80 (http), 30 hops max 1 192.168.113.1 0.842 ms 2.216 ms 2.130 ms 2 10.141.12.77 0.707 ms 0.767 ms 0.738 ms 3 10.141.12.33 1.227 ms 1.012 ms 1.120 ms 4 10.141.3.107 0.372 ms 0.305 ms 0.368 ms 5 12.112.4.41 6.688 ms 6.514 ms 6.467 ms 6 cr84.phlpa.ip.att.net (12.122.107.214) 19.892 ms 18.814 ms 15.804 ms 7 cr2.phlpa.ip.att.net (12.122.107.117) 17.554 ms 15.693 ms 16.122 ms 8 cr1.wswdc.ip.att.net (12.122.4.54) 15.838 ms 15.353 ms 15.511 ms 9 cr83.wswdc.ip.att.net (12.123.10.110) 17.451 ms 15.183 ms 16.198 ms 10 12.84.5.93 9.982 ms 9.817 ms 9.784 ms 11 12.84.5.94 14.587 ms 14.301 ms 14.238 ms 12 10.141.3.209 13.870 ms 13.845 ms 13.696 ms 13 * * * … 30 * * * I tried it again with 100 hops, just to be sure – the packets never get there. So how is it that the server does respond to requests via http, even after a minute? Shouldn't all requests just die? I'm not sure how to proceed debugging why this server is slow (as opposed to why it responds at all).

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