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• Do glue records in non-circular dns-lookups speed up domain resolution or not?

  - by Joe Hopfgartner

  Doing a lookup for my domain on http://www.intodns.com/ I noticed theese two messages: In Parent section: DNS Parent sent Glue The parent nameserver g.gtld-servers.net is not sending out GLUE for every nameservers listed, meaning he is sending out your nameservers host names without sending the A records of those nameservers. It's ok but you have to know that this will require an extra A lookup that can delay a little the connections to your site. This happens a lot if you have nameservers on different TLD (domain.com for example with nameserver ns.domain.org.) and in NS section: Glue for NS records INFO: GLUE was not sent when I asked your nameservers for your NS records.This is ok but you should know that in this case an extra A record lookup is required in order to get the IPs of your NS records. The nameservers without glue are: 109.230.225.96 84.201.40.52 You can fix this for example by adding A records to your nameservers for the zones listed above. I do perfectly understand that the primary objective of glue records is to resolve circular dependencies. The classic use case: my domain is example.com and I want to have the nameserver ns1.example.com. This will never work because i cannot know the ip of ns1.example.com if I don't fetch example.com and in order to do that I need to fetch it from ns1.example.com. To resolve this deadlock I add a glue record to ns1.example.com containing the ip adress of the nameserver, so this can work out. So this problem does not occour if the nameservers are in a different TLD than the domain i want to look up. But however to fetch the zone information from the nameservers I need to know their ip adress right? And in order to know that i need to fetch the zone the nameservers are in from their respective nameservers, right? (or rather my ISP needs to do that in the background) So an extra lookup that takes time? If I now have glue records, I know the IP adress right away without the need to look it up - so this should speed up the resolution of my domain, shouldnt it? However my DNS zone provider (tecserver.at) replied that this would make no sense because "we are not running ns1.ourdomain.com an ns1.ourdomain.com as authorative NS for ourdomain.com. This would be the only sense for glue records. Tecserver has a glue record because the NS for tecserver.at are ns1.tecserver.at and ns2.tecserver.at. Therefore a glue record is needed for resolution.

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• a hidden program (virus) send hundred e-mail - Can you have any experience on something similar ?

  - by Aristos

  In one tablet computer yesterday I make the usually automatic updates from ms. This tablet have comodo firewall, and and old nod32. After that I notice very soon, that something start sending hundred smtp e-mail the moment the tablet computer is connected to the internet. Also the previous t time I have make updates, some 'virus' gets on the computer but I find very easy and stop it from run. I find using the autostart from sysinternals, and the process explorer. This virus has also break the automatic update from ms, and lost a lot of time to fix it. This is my usually practice when some call me to delete a virus from xp, I use the process explorer and autostart to locate the program, and delete it from everywhere. How ever the last one is so hard to locate. 0.I delete everything from temp directorys and search for suspicious files everywhere, run the nod32, 1.I use the TCPView to see witch program sending the smpt (I see hundred open smpt connections sending emails) but the SMTP was opened by the main service program. 2. I use the process monitor to locate whats happens but find again the main service that do the job. 3.I start delete many thinks on process explorer, but did not found the one that send the emails 4.I open many times the autorun but did not find there also something suspicion, I stop some thinks, but nothing happends. 5.From the last time that I suspect that this virus come to my computer and I partial remove it, he has broke my windows update, to fix it I lost a lot of time, searching on Internet for the error - it was just a register to a dll. 6.From what I suspect something is trigger after the ms update. 7.For the moment I block the email ports, and try to find a way to locate it. I like to notice here that everything is genius - and I mean everything. I believe that this virus pass from a page, or from an e-mail that this computer receive it in the past. Any help or information are appreciate. If you know anything similar, if you know how this virus send emails and how can I locate it, if you know any anti-virus anti-spyware program that maybe can find it. If you know how a virus gets after the ms updates. Million thanks.

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• postfix destination concurrency

  - by Hamlet

  Hi, I have a website sending email using phpmailer - Centos, postfix, php, mysql etc Emails are getting delivered to all hosts correctly except one. Mar 30 14:38:22 server postfix/qmgr[15467]: 7237D218852D: to=, relay=none, delay=0.04, delays=0.04/0.01/0/0, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mail06.indamail.hu[91.83.45.46] while sending MAIL FROM) They told me to limit concurrent connections to 2 to their server. I did, but they still say I connect more than twice. main.cf: default_destination_concurrency_limit = 1 fallback_relay = smtp_destination_concurrency_limit = 1 initial_destination_concurrency = 1 Any ideas? Thanks, Hamlet

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• How can I send an email from Mail.app to Outlook with an attachment that does not embed into the email body?

  - by JAG2007

  I'm using Mail.app (on Mac OS X 10.6) and when I send an email to users on PC Outlook, with an attached image, they get the email as an image embedded into the body, not as an attachement. I even tried clicking "view as icon" before sending the attachment from Macmail, but that made no difference. I also tried this myself, sending from Mail.app over to my PC's Outlook, and I do get that same problem. In Outlook the image is not coming through as an attachment, but as an image embedded into the body of the email. The reason this is an issue primarily is because the user is then unable to click "save as" and has to actually copy and paste it into some other program, which means the file is converted from jpg or png to the bmp format. But beyond that, most of my recipients don't even know how to copy and paste it into another program to save it that way anyway. They need the "save attachment as" functionality.

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• SMTP for multiple domains on virtual interfaces

  - by Pawel Goscicki

  The setup is like this (Ubuntu 9.10): eth0: 1.1.1.1 name.isp.com eth0:0 2.2.2.2 example2.com eth0:1 3.3.3.3 example3.com example2.com and example3.com are web apps which need to send emails to their users. 2.2.2.2 points to example2.com and vice-versa (A/PTR). MX - Google. Google handles all incoming mail. 3.3.3.3 points to example3.com and vice-versa (A/PTR). MX - Google. Google handles all incoming mail. Requirements: Local delivery must be disabled (must deliver to MX specified server), so that the following works (note that there is no local user bob on the machine, but there is an existing bob email user): echo "Test" | mail -s "Test 6" [email protected] I need to be able to specify from which IP/domain name the email is delivered when sending an email. I fought with sendmail. With not much luck. Here's some debug info: sendmail -d0.12 -bt < /dev/null Canonical name: name.isp.com UUCP nodename: host a.k.a.: example2.com a.k.a.: example3.com ... Sendmail always uses canonical name (taken from eth0). I've found no way for it to select one of the UUCP codenames. It uses it for sending email: echo -e "To: [email protected]\nSubject: Test\nTest\n" | sendmail -bm -t -v [email protected]... Connecting to [127.0.0.1] via relay... 220 name.isp.com ESMTP Sendmail 8.14.3/8.14.3/Debian-9ubuntu1; Wed, 31 Mar 2010 16:33:55 +0200; (No UCE/UBE) logging access from: localhost(OK)-localhost [127.0.0.1] >>> EHLO name.isp.com I'm ok with other SMTP solutions. I've looked briefly at nbsmtp, msmtp and nullmailer but I'm not sure thay can deal with disabling local delivery and selecting different domains when sending emails. I also know about spoofing sender field by using mail -a "From: <[email protected]>" but it seems to be a half-solution (mails are still sent from isp.com domain instead of proper example2.com, so PTR records are unused and there's more risk of being flagged as spam/spammer).

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• How should I setup separate mx records for a subdomain?

  - by Chris Adams

  Lets say I have a domain that I run a web app on, for example cranketywidgets.com, and I'm using google apps for handle email for people work work on that domain, i.e. support@ cranketywidgets.com, [email protected], [email protected] and so on. Google's own mail services aren't always the best for sending automated reminder emails, comment notifications and so on, so the current solution I plan to pursue is to create a separate subdomain called mailer.cranketywidgets.com, run a mail server off it, and create a few accounts specifically for sending these kinds of emails. What should the mx records and a records look like here for this? I'm somewhat confused by the fact that mx records can be names, but that they must eventually resolve to an A record. What should the records look like here? cranketywidgets.com - A record to actual server like 10.24.233.214 cranketywidgets.com - mx records for google's email apps mailer.cranketywidgets.com - mx name pointing to server's ip address Would greatly appeciate some help on this - the answer seems like it'll be obvious, but email spam is a difficult problem to solve.

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• Outputting SVN hook messages

  - by Luke Segars

  Hi all, I have a subversion repository on my Linux machine that is set up to export a new build of a project every time a new commit occurs using a post-commit hook. I would really like to be able to provide an output message to the committer containing some status information once the hook completes. Is it possible to redirect the output of the hook to come after the standard commit messages? For example: owner@dev-machine:/working/dir$ svn commit Sending FILE1 Sending FILE2 Transmissing file data ... Committed revision 13. Exporting project... Successfully exported to mysite.com The addition of the last two lines is the functionality I'm looking for.

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• setting up delegate or smtp forwarding

  - by cotiso

  for work we have a remote dedicated server to run our webservice that also runs our email services, at home(comcast residential internet) i cannot send mail using the dedicated server's SMTP, comcast spits back a error saying i can only use their SMTP server for sending mail at work(comcast business internet) we can use our dedicated server for sending mail with no problem so i set up a box at work to forward smtp traffic, i'm new to all this networking stuff by the way i used delegate to forward smtp traffic, can someone point me in the right direction on how to use this program(delegate) to fix our issue the delegate command i used to test is : delegated -P25 SERVER="smtp://dedicated.server.com:25" PERMIT=":::" -v i also opened up port 25 on the router so it points to my boxes ip are there any other ways to fool comcast into thinking im using my works ip to send mail, my coworkers and i are unable to send mail from home for some time now thanks

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• Give root password for maintenance

  - by Jevgeni Smirnov

  After entering shutdown now in terminal I get everything running normally and then: All processes ended withing 2 seconds...done INIT: Going single user INIT: Sending processes the TERM signal INIT: Sending processes the KILL signal Give root password for maintenance(or.... I press Ctrl+D, and it shows me login screen Debian. Shutdown through GUI works properly. UPDATE 1 It seems some process hangs. Moreover I'v managed to poweroff server through several retries. Recently i'v installed only ntp and ntpdate. Nothing more. I suppose it might be it conflicting with iptables.

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• udhcpc doesn't assign ip address

  - by Diab

  i have a board running linux 2.6.28 and i have one Ethernet interface (eth0) i want dhcp to assign dynamic ip to this interface. i have busybox with udhcpc in the file system and the kernel has the "Pack Socket" enabled so i copied the scripts from "busybox-1.14.1/examples/udhcp" to my board on "/etc/udhcpc/" (i created this directory) and when i run : ifconfig eth0 up the interface is up but without ip address, then running udhcpc -i eth0 -s /etc/udhcpc/sample.script i get the following: note : sample.script contains : "exec /etc/udhcpc/sample.$1" # udhcpc -i eth0 -s /etc/udhcpc/sample.script udhcpc (v1.14.1) started Sending discover... Sending select for 192.168.10.198... Lease of 192.168.10.198 obtained, lease time 691200 but when i check with ifconfig i can see that it didn't assign the ip address to eth0. anyone have an idea why udhcpc didn't assign the ip ? Thanx

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• Running a webserver behind a firewall I have no access to

  - by reijin

  I'm having a bad time in my student appartment: I want to run a webserver on my Laptop, which should be reachable from outside of the net. I'm sitting behind some proxy-server that passes outgoing packets to the matching server. But when it comes to incoming messages - it wouldn't route them correctly to my PC. (Seems like packets only get passed if some PC from within the student-flat is already connected to the sending server) In the past I had a small virtual private server that was sending incoming website-requests over a reverse shell to my PC. Which then returned the website content, and the visitor could see my website. Sadly I dont have that server anymore... Do you have any idea that might solve my problem? Greetings, Benedikt

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• 550 relay not permitted

  - by Nick Swan

  Hi, we are using Fogbugz on our server to do customer support emails. Occasionally though we get errors coming back when sending emails of: 550 relay not permitted This seems to happen at random though, sometimes sending an email to a person works, next time to the same person it'll bounce back. I've tried setting up reverse DNS with the server host and creating the SPF record in GoDaddy but we still get some of these errors. Is there anything else I can do, and is there a way of testing these are actually configured correctly? Many thanks, Nick

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• Failed reverse DNS and SPF only when using Thunderbird!

  - by TruMan1

  I have a reverse DNS and SPF records correctly setup for my mail server. Sending webmail from it works perfect. The problem is when Thunderbird sends out emails, it is using the client's IP address for the hostname. I have SMTP authentication and specified my mail server's as the outgoing SMTP. Mail is being sent, but it is not "signing" the email with the mail server's IP address.. it is using the client's. Is there any way to fix this? This is the spam error I get when sending from Thunderbird: Spam: Reverse DNS Lookup, SPF_SoftFail

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• Linux - use dhcp again to get IP

  - by Markus Orreilly

  I had statically set my ip in Linux using: sudo ifconfig eth0 192.168.blah.blah Now I want it to go back to using DHCP to assign the IP. How do I do that? This is what I see when I run dhclient Internet Systems Consortium DHCP Client V3.1.2 Copyright 2004-2008 Internet Systems Consortium. All rights reserved. For info, please visit http://www.isc.org/sw/dhcp/ Listening on LPF/eth0/08:00:27:9b:43:09 Sending on LPF/eth0/08:00:27:9b:43:09 Sending on Socket/fallback DHCPREQUEST of 192.168.56.104 on eth0 to 255.255.255.255 port 67

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• Does an SMTP request contain host header information (or just the IP of the targeted SMTP server)?

  - by Olaf

  We are using an external commercial smtp server for our newsletters (sending them through .NET components), and they offer two smtp URLs - smtp.critsend.com and fast.critsend.com -, and the second one is reserved for sending singular emails, the first one for bulk. Using nslookup shows that both resolve to the same 4 IP addresses (fast.critsend.com being an Alias). Question: (how) is it possible for the smtp relay to distinguish between different names? Is there something in the headers that can be compared to host headers in http protocol (I didn't find any intelligible information for a non-sysadmins)? The reason I'm asking is because we would like to use one of the IPs in our newsletter script (which works) rather than a name (in order to save DNS requests), and we are wondering about potential problems.

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• Wireless traffic stops when downloading large files at high speed: packets lost (Linksys WRT120N router)

  - by Torious

  The problem Note: First I'd like to understand WHY this is happening. Ofcourse, a solution would be nice too. :) When downloading a large file over HTTP at high-speeds, my wireless traffic basically stops: I can't open webpages and the download itself pauses. It pauses pretty much immediately after starting it; sometimes at 800 KB, sometimes at a few MB. After some time, the download (and other traffic) resumes, but the problem keeps reoccurring during the same download. The problem does not occur when using a wired connection through the same router (Linskys WRT120N). Also note that the connection is not dropped when this happens. It's just that the traffic stops and I can't browse to web pages, etc. (SYN packets are sent but nothing is received, etc.) Inspection with Wireshark shows that the following happens: Server sends data packets which are acknowledged by client Server sends a packet, but SEQ indicates some packets were lost (6 packets in one occurrence). Server sends a few more packets and client acknowledges these using "selective acknowledgement" Server stops sending data for a while (since the lost packets were not acknowledged or the router stops forwarding them?) Eventually, server does a "retransmission" and traffic resumes as normal. This all seems normal behavior to me when packet loss occurs. It's the consistent packet loss throughout a large, high-speed download that puzzles me. What might cause this? My own idea is the following: My internet is pretty fast (100 mbps), so when starting a large-file download, the router buffers the incoming data (since wireless introduces some slight delay / lower speed, in part due to other networks), but the buffer overflows and the router drops packets to regulate traffic (and because it has no choice). But how could that happen? Doesn't the TCP window size limit the amount of data that can go unacknowledged? So how can the router's buffer overflow if there can only be like 64 KB waiting to be acknowledged? Note: I've disabled TCP window scaling and dynamic window size through netsh options, in an attempt to fix this, but it doesn't seem to matter. Also, Wireshark shows a pattern of the server sending 2 packets (of 1514 bytes) and the client sending an ACK, so does that rule out a possible buffer overflow? And a few more subsequent packets are received... I'm at a loss here. Thanks for any insights. Things that are (probably) NOT the cause / I have experimented with The browser Various TCP options in Windows 7 (netsh etc.) Router settings such as MTU, beacon interval, UPnP, ...

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• Create access point (uap0) on debian 7(arm) - not found?

  - by ethrbunny

  I'm working with a fanless PC that has an ARM chipset, 2 eth plugs and a wifi card (among other things). If I install debian 6 on it all three network interfaces are available at boot time. Today I tried to install debian 7 and had numerous errors indicating that the wireless card isn't supported. uap0: error fetching interface information: Device not found SIOCSIFADDR: No such device uap0: ERROR while getting interface flags: No such device uap0: ERROR while getting interface flags: No such device No such device ERR:UAPHOSTCMD is not supported by uap0 ERR:Command sending failed! No such device ERR:UAPHOSTCMD is not supported by uap0 ERR:Command sending failed! I've tried comparing the kernel module list to the working system but there are too many other differences to make something obvious enough (to me) stand out. How would I get started debugging this problem?

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• Meraki's Accounting-Requests to RADIUS server

  - by PachinSV

  I'm running a RADIUS server with some Meraki APs, the process of Authentications is fine... But it seems that the Meraki Cloud Controller is just sending the authentication packets and not the accounting requests. I've tested the RADIUS sending accounting requests with the radclient tool (locally) and it worked. I think that maybe my RADIUS server is ignoring the accounting requests from the MCC because there are some Vendor Specific Attributes that my RADIUS doesn't know. should I add a Meraki's dictionary to my RADIUS configurations? I'm kind of desperate, any idea?

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• Gmail flagging emails as spam despite SPF being enabled and working perfectly

  - by Asif

  I have a website where people can recommend contents to their friends using their email. The issue is that emails are being flagged as spam whereas if I do the same from my development machine things are working out fine. I have enabled SPF and it is perfect. When sending through website, the email appears as this in Gmail Inbox: From [email protected] to [email protected]. When I send it from my development machine it appears as : From xyz.com via mywebsite.com to [email protected] mailed by mywebsite.com and this is exactly how I envisioned it. From what little I could figure out by looking at the source of emails in Gmail is that when sending from my development machine Gmail correctly recognizes my domain as mywebsite.com for which SPF is enabled and hence it treats it as genuine email. Whereas Gmail recognizes my domain as [email protected] when sent through the website. Can someone tell me why it does so? Any help would be really appreciated.

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• Windows Server 2008: Limit UDP/TCP packets per IP or ban

  - by WBAR

  How I can limit UDP/TCP packets per IP send to my host (or better PORT) per second or minute ? Would be nice to ban that IP for 12/24 hours or even for ever. I got Windows Server 2008 and I'm very poor in Windows administration but quite good in Linux. EDIT: By basic problem is that They sending a lot of rubbish UPD and TCP packets.. TCP packets without SYNCH, fragmented UDP packets so my servers stop responding.. So I need to cut off users (IPs) sending more than X packets per second. I need solution witch provides me, somehow, configurable: X packets of certain type (UDP, TCP or both - lets say parameter named Z ) are allowed to be received by IP on Y port, otherwise this packet should be DROPPED. My virtual hosts are hosted by VirtualBox and I'm able to forward all incoming packets certain type and certain port to the specific Virtual Host, but I need to DROP them before my VirtualBox receive them.

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• TightVNC (or any VNC) client windows scaling

  - by mr.b

  Hi, I am currently using TightVNC to connect to multiple remote hosts in LAN. I start 16 VNC instances, set Scaling by: Auto (in connection options display), set Hextile encoding, and then select all windows and use Tile Horizontally, which covers my entire screen with VNC screens. It all works sort of nice, except that desktop interaction is really slow when there are more then 4 VNC clients. My question is, does VNC client (not just TightVNC, but any compatible client) support some kind of smart scaling option, so that client tells server something along the lines of: "Okay, I'm displaying your entire screen in a window size 300x225 px, so can you please start sending encoded images on that resolution?", at which point interactiveness of open connections dramatically increase, and when I decide to go full screen on some connection, client and server re-negotiate and server starts sending full resolution images again? Thanks!!

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• Can I send HTML mails in Outlook Web Access?

  - by Mestika

  Hi, In my organization some of the employees are located elsewhere from headquarter and therefore they are using the Outlook Web Access (OWA) to receive and send E-mails. The problem lies in the format in how E-mails are sending and forwarded. When receiving an E-mail which has HTML context (e.g. tables) it shows it right enough but when the same E-mail is forwarded it completely disturb the layout and it seems like it only can send in pure text. Is there any way I can enable HTML to me used for sending and forwarding E-mails through OWA, either via the settings in the OWA or our Exchange server? Thanks Sincerely Mestika

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• nginx conditional Accept header

  - by manu_v

  Some mobile devices send the following incorrect requests to our servers : GET / HTTP/1.0 Accept: User-Agent : xxx The empty Accept header causes our Ruby on Rails server to throw back a 500 error. In Apache, the following directive allows us to rewrite the header before sending it to the application RoR server in order to cope with the broken devices : RequestHeader edit Accept ^$ "*/*" early We're currently setting up nginx, but achieving the same work-around is proving difficult. We are able to set : proxy_set_header Accept */*; However, this seems to have to be done inconditionally. Whenever trying to do : if ($http_accept !~ ".") { proxy_set_header Accept */*; } It complains with the message : "proxy_set_header" directive is not allowed here So, using nginx, how can we set the HTTP Accept header to */* when it is empty before sending the request to the application server ?

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• How to block other (non user) to post in to google groups ?

  - by abc

  I have my own google group i want outsider to block sending mails into group , how to do?

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• Setup CENTOS Centralized AUDIT and RSYSLOG server

  - by Warron.French

  Attempting to use these links: Sending audit logs to SYSLOG server or http://wiki.rsyslog.com/index.php/Centralizing_the_audit_log I have been unable to get centralized AUDIT logging to work on my ALL-CentOS network environment. I have 6 workstations dt1...dt6, and the log files are not generated at all and I cannot tell if the messages are being sent from these workstations: dt1..dt6 over to the server (srv1). I have configured the rsyslog.conf on the workstations as shown in the link: Sending audit logs to SYSLOG server, and add the additional touches for generating the logfiles into a separate directory per YEAR/MONTH/DAY (using proper syntax) and into separate HOSTNAME-based_audit.log files. Note: RSYSLOG messaging does appear to work from the workstations over to the server, but the audit logging portion is not working. I am running CentOS-6.5 with RPMs: audit-2.2-4.el6_5.x86_64, audit-libs-2.2-4.el6_5.x86_64, and rsyslog-5.8.10-8.el6.x86_64 I have gotten zero responses from wiki.rsyslog.com and really need this to work. If needed I can send files of one of my workstations and the server to aid in the process. Thanks, Warron

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