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• Why should one have a secondary DNS server?

  - by Sam Levin

  I'm very confused. I basically understand how DNS works. Here's an example that helps illustrate what I'm having trouble understanding. Right now, I run a small web-server. I use my provider's DNS manager, so I don't have a DNS server hosted on the machine. Let's say for a second, that I don't use my host's DNS, and I decide to set up a DNS server on my server. Hypothetical scenario: my server (entire) server goes down - DNS included. Why do I need backup DNS? If the server is down, who cares if the DNS server is down too, considering that even if I had DNS up (it wasn't on the crashed server), it wouldn't be able to forward requests anyway since the server would be down? Is the point of having secondary DNS, to be able to change the IP addresses that your DNS server points to, so if your webserver was down, you could redirect traffic to a backup? How would you switch to the secondary provider, in the event that your main DNS provider becomes unavailable? Is a backup DNS system basically up all the time? How is it configured? Is it just an exact clone of the DNS server you would have on your server? Do they run simultaneously? Hopefully someone can see what I'm hung up on, and provide some guidance. Thanks

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• openvpn& iptables -- portforwarding and gateway

  - by Smith.Lai

  The problem is similar to this scenario: iptables rule still take effect after deleted Scenario: There are several clients(C1~C10) providing some services, such as SSH,HTTP..... The clients are actually a personal computer behind NAT. Their IP might be 192.168.0.x For easily access these machines through internet, I built a OpenVPN server(S1). All the C1~C10 connect to S1 with VPN address 10.8.0.x If A user(U1) wanna access C1 SSH through internet, he can connect to S1 with port "55555", and S1 port forward 55555 to 10.8.0.6:22 echo 1 /proc/sys/net/ipv4/ip_forward iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 55555 -j DNAT --to-destination 10.8.0.6:22 It works well until I mark the following in the openvpn server.conf: I marked this because I think this will make all connection go through S1 ;push "redirect-gateway" |-------(NAT)--------| (C1)--| (INTERNET)----(U1) |-----(VPN)----(S1)--| The C1~C10 have their own path to access internet resource through NAT . The server loading would be heavy if all C1~C10 connection go through S1 (for example, C1 is sending data to C2, or C1 is downloading data from a FTP site). Is there a way to solve this quandary?

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• DNS something is wrong?

  - by Nickolas R.

  Hello I am configuring bind9 on a server with two network interfaces, one is connected to the LAN and the other is connected to the Internet through NAT so bind is not faced directly to the Internet. Everything seems to work fine, clients can do both forward and reverse lookups but somethings seems strange. On the server if i try to ping www.google.com one time, a great amount of network activity is genereated, alot more that one would expect so i decided to sniff the traffic with tcpdump. When loading the dump into Wireshark i can see about 250 entries with "Standard query A" and "Standard query response" Here a some of the entries from the dump DNS Standard query A www.google.com DNS Standard query A blackhole-1.iana.org DNS Standard query A blackhole-2.iana.org DNS Standard query response DNS Standard query A ns2.isc-sns.com DNS Standard query A ns1.isc-sns.net DNS Standard query A ns3.isc-sns.info DNS Standard query response PTR b.iana-servers.net RRSIG DNS Standard query A auth2.dns.cogentco.com DNS Standard query A ns1.crsnic.net DNS Standard query A ns2.nsiregistry.net DNS Standard query A ns3.verisign-grs.net DNS Standard query A ns4.verisign-grs.net DNS Standard query PTR 79.52.19.199.in-addr.arpa I do not have too much experince with DNS yet, but i am pretty sure that something is wrong. Anybody that have an idea of whats is going on?

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• Flushing iptables broke my pipe, how can I save my instance?

  - by Niels

  I was setting up my iptables when I performed a iptables -F and my ssh pipe broke. This is the last output of my session: root@alfapaints:~# iptables -L Chain INPUT (policy DROP) target prot opt source destination ACCEPT all -- anywhere anywhere ACCEPT tcp -- anywhere anywhere state NEW,ESTABLISHED tcp dpt:2222 ACCEPT tcp -- li465-68.members.linode.com anywhere state NEW,ESTABLISHED tcp dpt:nrpe ACCEPT tcp -- anywhere anywhere tcp dpt:9200 state NEW,ESTABLISHED ACCEPT tcp -- anywhere anywhere tcp dpt:http state NEW,ESTABLISHED ACCEPT udp -- anywhere anywhere udp spt:domain Chain FORWARD (policy DROP) target prot opt source destination Chain OUTPUT (policy DROP) target prot opt source destination ACCEPT all -- anywhere anywhere ACCEPT tcp -- anywhere anywhere state ESTABLISHED tcp spt:2222 ACCEPT tcp -- anywhere anywhere state ESTABLISHED tcp spt:nrpe ACCEPT tcp -- anywhere anywhere tcp spt:9200 state ESTABLISHED ACCEPT tcp -- anywhere anywhere tcp spt:http state ESTABLISHED ACCEPT udp -- anywhere anywhere udp dpt:domain root@alfapaints:~# iptables -F Write failed: Broken pipe I tested my connection just before and I was able to connect with ssh. Now I did a nmap scan and not a single port is open anymore. I know my VPS is running on VMWare ESXi, could a reboot help? Or if not could I attach and mount the disk to another vm to save the data? Does anybody have some advise? And maybe an explanation what happend or what could have cause my pipe to break? ps: I didn't save my rules on the config directories of iptables. But used a file I stored in ~/rules.config to apply my rules like this: iptables-restore < rules.config So probably a reboot would help? Thanks a lot in advance.

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• What is a good client for handling large amounts of mail ?

  - by ldigas

  Although the title sums it up nice, I'll repeat and explain. What would be a good email client for handling large amounts of mail ? Large portion of mails I receive come with attachments (zip, rar, pdf, dwg, etc.) and within a month I usually have another 1,5-2Gb of new mail. I've noticed that 'standard' Outlook Express (with whose interface I've been very happy) gets awfully slow after a while. Archiving helps but not much. Then I usually take the files, move them onto a dvd, delete all messages I can do without and start anew. The thing is, I would love to have them all in email client since I often go after some old mails (slow projects). So, what would be good alternatives ? If it is portable, that would also be nice, but I can also live without it. post scriptum: I love @gmail, but cannot use it for work. I know I could theoretically forward all of it there, and back, but that approach doesn't make my boss very happy (email handling policies and similar).

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• When pointing to new DNS servers is there any chance of E-mails being lost if the old E-mail hosting service is still up?

  - by LaserBeak

  I am changing webhosts and will be using the new hosts mail servers instead of the old ones. I have created all the correctly named mailboxes on the new service but have also not yet cut ties with the old webhost. I am expecting that even if the new DNS values which point to the new hosts DNS servers and respective SOA\zone file with the new MX values have not yet propagated and an E-mail is directed at the old hosts mail servers as per the mx records in the SOA\zone records which the old hosting provider holds, the E-mail would still come through to the mailbox that's on the old host providers mail servers. So I am just trying to reaffirm if I got this right and it's essentially impossible for me to loose an E-mail since it will hit either the old hosts mail servers or the new ones ? Also is it possible to configure the same E-mail account to check and collect mail from different mail servers by entering multiple pop3 addresses ? And if I choose to keep the old web hosts mail hosting services as a backup by specifying the mx records for it with a lower priority in the SOA records hosted by the new webhost, is it possible to have any incoming E-mails sent to both servers by the mail daemon so I have two copies? Or is my only option having the primary mail server forward the E-mail somehow to the old mailserver ?

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• CMS/Wiki to use for a HTML5 video site

  - by Clinton Blackmore

  Greetings. I want to put up a website with instructive screencasts, and allow for people to add comments to them. I would like use the Video for Everybody technique, partly because I dislike Flash and because it helps in a small way to move the web forward [while being backwards compatable]. I recognize that HTML5 is still in draft, and that support for it varies. I do have some hosting space, and can run Perl, PHP, and Ruby on Rails applications, with a MySQL backend. I should mention that part of my working job involves running some web servers, and that I am a programmer by training (with only a limited familiarity with Perl and PHP, and none with Ruby). I should mention why I don't particularly want to go with a video hosting site (like YouTube or Vimeo): Flash Video Resolution and Quality [I'd like to put up 800x600 videos] Videos promote a club that is not stricly non-profit [ie. may fall afoul of Terms of Service] I'm already paying for web hosting, and free video hosting comes with time and bandwidth limits I don't want there to be two locations where you can comment on the video Now, having said all that, I'd be quite comfortable putting up my own HTML pages, except: that's so web 1.0! :) [ie. it does not allow for comments] I also want to do some blogging and possibly put up a wiki; the site will not be entirely screencasts So, can anyone recommend a CMS (or Wiki, or similar application) that I can customise for this purpose?

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• Setting up Red Hat Enterprise Linux Server as a mail exchange server

  - by Syedur

  I am a Unix/Linux/Windows Server noob. So, keep that in mind before you throw your stones at my glass house. :P I have a Windows Server 2008 R2 machine that's acting as domain controller, Server A. It's also running a DNS server. I have a Red Hat Enterprise Linux Server 5.3, Server B that is intended for mail server. In order for the mail delivery to happen, I understand that I have to set an MX record on Server A and point it to Server B. Well, I did. I manually added a host name on Server A and pointed to Server B's IP address. Then I added an MX record and pointed it to the host name. That didn't do the trick. After taking the above steps, I used the "dig" command on Server B to lookup the MX record coming back from Server A and it wasn't what I was expecting. What am I doing wrong here? I have noticed that... my Windows machines that are joined to the domain (Server A) are listed under the host names. The machines that are not joined to the domain are not list. This is fine, I am not worried about this. What does concern me, do I have to join the Server B to domain in order for Server A to recognize as a valid host and forward the MX properly? If so, some simple steps on how to join Server B to the domain would also help.

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• grepping a substring from a grep result

  - by allentown

  Given a log file, I will usually do something like this: grep 'marker-1234' filter_log What is the difference in using '' or "" or nothing in the pattern? The above grep command will yield many thousands of lines; what I desire. Within those lines, There is usually one chunk of data I am after. Sometimes, I use awk to print out the fields I am after. In this case, the log format changes, I can't rely on position exclusively, not to mention, the actual logged data can push position forward. To make this understandable, lets say the log line contained an IP address, and that was all I was after, so I can later pipe it to sort and unique and get some tally counts. An example may be: 2010-04-08 some logged data, indetermineate chars - [marker-1234] (123.123.123.123) from: [email protected] to [email protected] [stat-xyz9876] The first grep command will give me many thousands of lines like the above, from there, I want to pipe it to something, probably sed, which can pull out a pattern within, and print only the pattern. For this example, using an the IP address would suffice. I tried. Is sed not able to understand [0-9]{1,3}. as a pattern? I had to [0-9][0-9][0-9]. which yielded strange results until the entire pattern created. This is not specific to an IP address, the pattern will change, but I can use that as a learning template. Thank you all.

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• Router to WIFI Client to Router (New solution for distance when repeater doesnt help)

  - by Kangarooo

  Ethernet to TL-WR340G with WIFI enabled Using TL-WA500 tried repeater mode which was not good enough and had password problems (could not connect if using either ASCII or Normal password in one way then in repeater worked other way) and also could not forward (repeat) WPA/WPA2 security. So since this repeater can also be as client, I made it as client and used another router (TL-WR740N) to get from wire connection from that client and all was working for a little bit. Every machine is set up to be auto DHCP. 1st when setting up client mode I found it working after doing reset. Then after some tens of minutes internet stopped working. When I removed WiFi client then all went back to normal. Where is the problem and how to make this work? Ethernet- TL-WR340G(AutoDHCP) ==> wifi ==> TL-WA500 TL-WA500 wifi client mode(AutoDHCP) ==> wire ==> TL-WR740N TL-WR740N router mode (AutoDHCP) ==> My Computer In other words: TL-WR340G ) ) ) ) TL-WA500 ===== TL-WR740N ==== PC1 ) ) WiFi === Wire

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• Internet slowed down because of SQUID Server setup

  - by Ranjith Kumar

  Recently I have setup a squid server for our office. I have computer (A) with two ethernet cards, one for internet and the second one for local networkIt has Ubuntu server OS with squid-server and dhcp3-server installedI have added few iptable rules to work like a router and redirect all http traffic to 3128 port This link is my reference. Everything worked fine for 2 days. All of a sudden internet speed went down drastically. When I connected the internet cable to my laptop to test the internet speed it was fine. Again when I reconnected it back to computer A everything was normal. This happened 4 times in a week. Could anyone here please help me why the internet speed is going down and it becomes normal when I reconnect the cable. EDIT: Rebooting the system (computer A) didn't make a difference. I have changed iptables so that http traffic doesn't redirect to 3128 port any further, still no change in the internet speed. I think the problem is not with squid but with something else. Here are my iptable rules SQUID_SERVER="10.1.1.1" INTERNET="eth1" LAN_IN="eth0" SQUID_PORT="3128" PROXYSERVERS=(Atlanta Baltimore Boston Chicago Dallas Denver Houston KansasCity LosAngeles Miami NewYork Philadelphia Phoenix SanAntonio SanDiego SanJose Seattle Washington) SERVERLEN=${#PROXYSERVERS[*]} I=0 iptables -F iptables -X iptables -t nat -F iptables -t nat -X iptables -t mangle -F iptables -t mangle -X modprobe ip_conntrack modprobe ip_conntrack_ftp echo 1 /proc/sys/net/ipv4/ip_forward iptables -P INPUT DROP iptables -P OUTPUT ACCEPT iptables -A INPUT -i lo -j ACCEPT iptables -A OUTPUT -o lo -j ACCEPT iptables -A INPUT -i $INTERNET -m state --state ESTABLISHED,RELATED -j ACCEPT iptables --table nat --append POSTROUTING --out-interface $INTERNET -j MASQUERADE iptables --append FORWARD --in-interface $LAN_IN -j ACCEPT iptables -A INPUT -i $LAN_IN -j ACCEPT iptables -A OUTPUT -o $LAN_IN -j ACCEPT while [ $I -lt $SERVERLEN ]; do iptables -t nat -A PREROUTING -i $LAN_IN -p tcp -d ${PROXYSERVERS[$I]}.wonderproxy.com --dport 80 -j ACCEPT let I++ done iptables -t nat -A PREROUTING -i $LAN_IN -p tcp --dport 80 -j DNAT --to $SQUID_SERVER:$SQUID_PORT iptables -A INPUT --protocol tcp --dport 80 -j ACCEPT iptables -A INPUT --protocol tcp --dport 443 -j ACCEPT iptables -A INPUT --protocol tcp --dport 22 -j ACCEPT iptables -A INPUT -j LOG iptables -A INPUT -j DROP

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• Unable to communicate with EWS from Exchange Server

  - by kschieck

  We are currently running a 2 server exchange environment with Edge services on their own. We are in the process of trying to deploy a piece of software that uses the EWS API which has brought me to this form, the software ties into the EWS service and uses it to forward messages (this is failing). Using the software error logs I have found that accessing EWS from the exchange server is not possible. From my work machine and an external address I can type the following https ://webmail.companyname.com/ews/exchange.asmx and be prompted for a username and password, once I enter credentials I get a screen full of information from services.wsdl. The problem is when I try the same URL from the exchange server and get the credentials prompt I cannot get past it. Even with the same credentials that work externally and from my desk it just keeps looping around. Capture from software log (11:41:32.6415 000017e4 System.Net.WebException: The request failed with HTTP status 401: Unauthorized.) I have also found the same results when trying https://webmail.companyname.com/ Autodiscover /Autodiscover.xml . Environment Information Server 2008 STD 64bit Exchange 2007 SP1 Purchased Cert – webmail.companyname.com I have also confirmed that all services have the proper internal and external URL’s. Any help would be appreciated.

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• SCM8014 to FVS338

  - by Jack

  I have a SMC8014 Router/Modem that Comcast provided me with their business class service. It was not filtering malicious traffic as aggressively as I had hoped, so I purchased a NetGear ProSafe FVS338, and put this behind the SMC8014, and all my machines behind that. After some brief configuration, all machines can see out to the internet. I also have a single web server, and I have not been able to configure things so that incoming requests can reach it. This is where I need help! I would like to have the FVS339 do NAT, so that I can assign a 192.168 address to my webserver. I've tried everything I know of, and I can't get things going. I set the SMC8014 to have a LAN facing IP of 10.0.0.1, and I assigned the FVS339 a WAN facing IP of 10.0.0.2. I would like to be able to tell the SMC8014 to just forward all traffic to 10.0.0.2, but I haven't had any success. In my (unfortunately limited) understanding, what I probably want here is a static route, but I don't know how to cofigure one, or if this is really what I want. The SMC8014 wants a Destination IP, a Subnet Mask and a Gateway IP. Any help would be appreciated.

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• Compiled ruby fails to find curses

  - by Hamish Downer

  I'm attempting to install the sup MUA but I'm having trouble. When I try to run it, it can't find curses: /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- curses (LoadError) ... I am installing on a server running CentOS 5. I have compiled ruby and rubygems from source, and then installed sup using rubygems. I followed this article to compile ruby. I have found having a similar problem on ubuntu. The fix suggested there is to install libcurses-ruby, but I can't find a similarly named package in CentOS. I have installed the ncurses-devel package, as that was required for installing sup using gem. I have also installed the ncurses, cursesx and rbcurse gems, but none of these have fixed the problem. The article above about compiling ruby said you had to recompile the zlib extension, after doing: cd ext/zlib sudo ruby extconf.rb --with-zlib-include=/usr/include --with-zlib-lib=/usr/lib cd ../.. sudo make sudo make install So I've tried a few variants in ext/curses. The top few lines of ext/curses/extconf.rb are require 'mkmf' dir_config('curses') dir_config('ncurses') dir_config('termcap') So I've tried a few variants of setting paths: sudo ruby extconf.rb --with-curses-include=/usr/include --with-curses-lib=/usr/lib --with-ncurses-include=/usr/include --with-ncurses-lib=/usr/lib --with-termcap-lib=/lib sudo ruby extconf.rb --with-curses-include=/usr/include --with-curses-lib=/usr/lib --with-termcap-lib=/lib and re-doing the make, but to no avail as yet. Any ideas to move it forward are welcome.

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• WSUS trying to download all updates again

  - by Tim Alexander

  The server hosting WSUS had a catastrophic failure and we have had to rebuild the system drives. Luckily the DB and content store for WSUS are on a seperate drive so were unaffected. During the rebuild process we thought it was time to update the server to 2008 R2 (from 2003 R2). Have got the server running and installed the WSUS role, detached the DB form SQL Express 2008 R2 and attached the original. Carried out the wsusutil.exe movecontent command with a -skipcopy switch pointing to the original content store. All looked good until I saw the front page stating it is trying to download files for 6,436 updates at around 344,565 MB!!!!!! Oops, I thought, something not right here. The content store I have on disk is only 75GB but I am thinking that some vital step has been missed in the restoration process. Either way is there a way to make WSUS reindex its local content store or something as I am unsure that downloading 344 gigabytes is a viable way forward! EDIT: Never rains but it pours. AM now getting a CLSID: FX {8b6499ed-0241-e032-6508-da4b1c879d7e} error could not create snap in. think a reinstall of WSUS is in order.

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• Trouble with IIS SMTP relaying to Gmail

  - by saille

  I appreciate that similar questions have been asked about how to setup SMTP relaying with IIS's virtual SMTP server. However I'm still completely stumped on this problem. Here's the setup: IIS 6.0 SMTP server running on Win2k3 box with a NAT'ed IP. Company uses Gmail for all email services. An app on the box needs to send email, so normally we'd just set the app up to talk to smtp.gmail.com directly, but this app doesn't support TLS. Easy, we just setup a local SMTP relay right? So I thought. What we have done so far: Setup IIS SMTP server to relay to smtp.gmail.com, as per these excellent instructions: http://fmuntean.wordpress.com/2008/10/26/how-to-configure-iis-smtp-server-to-forward-emails-using-a-gmail-account/ The local SMTP relay allows anonymous access. Both the local IP and the loopback IP have been explicitly allowed in the Connection and Relay dialogs. Tried sending email from 2 different apps via the local SMTP server, but failed (the emails end up in the Queue folder, but never get sent). The IIS logs show the conversation with the local app, but zero conversation happening with smtp.gmail.com. The port used by gmail is open outbound, and indeed the apps we have that support TLS can send email directly via smtp.gmail.com, so there is no problem with the network. At this point I changed the smtp settings in IIS SMTP server to use a different external SMTP server and hey-presto, the local apps can send email via local IIS SMTP relay. So smtp.gmail.com fails to work with our IIS SMTP relay, but another 3rd party SMTP service works fine. We need to use smtp.gmail.com, so how to troubleshoot this one?

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• Map FTP folder to folder on different FTP server

  - by jolt

  In my team we work a lot with FTP. We upload and download files from several different servers daily. Currently every member of the team manages access credentials to each FTP server locally on their own machine. I am looking for a way to set up a central FTP server that we can connect to, and from there, navigate to folders that each represent one of the other FTP servers that we connect to daily. Something like this: In-house central FTP server: |- FolderA --> server A root folder |- FolderB --> server B root folder |- FolderC --> server C root folder A setup like this, would mean that we can manage access credentials on the central FTP server, and team members would only need to have the access credentials to the central FTP server, and from there they could navigate to the other servers through these "virtual" folders. We could potentially develop our own custom FTP server that just forward requests to the remote FTP servers, but i feel like something like this (or something similar) would already have been done. So I'm looking for pointers that could help us find software for Windows that could help us to simplify our current setup. Thank you! Similar (unanswered) question here: FTP management server

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• Architecture for highly available MySQL with automatic failover in physically diverse locations

  - by Warner

  I have been researching high availability (HA) solutions for MySQL between data centers. For servers located in the same physical environment, I have preferred dual master with heartbeat (floating VIP) using an active passive approach. The heartbeat is over both a serial connection as well as an ethernet connection. Ultimately, my goal is to maintain this same level of availability but between data centers. I want to dynamically failover between both data centers without manual intervention and still maintain data integrity. There would be BGP on top. Web clusters in both locations, which would have the potential to route to the databases between both sides. If the Internet connection went down on site 1, clients would route through site 2, to the Web cluster, and then to the database in site 1 if the link between both sites is still up. With this scenario, due to the lack of physical link (serial) there is a more likely chance of split brain. If the WAN went down between both sites, the VIP would end up on both sites, where a variety of unpleasant scenarios could introduce desync. Another potential issue I see is difficulty scaling this infrastructure to a third data center in the future. The network layer is not a focus. The architecture is flexible at this stage. Again, my focus is a solution for maintaining data integrity as well as automatic failover with the MySQL databases. I would likely design the rest around this. Can you recommend a proven solution for MySQL HA between two physically diverse sites? Thank you for taking the time to read this. I look forward to reading your recommendations.

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• Macs don't connect to wifi access point but PCs will

  - by Josh

  So, as a side project I'm going to try and figure out why the wifi APs in my building exhibit the following behavior: - They typically allow all types of computers to connect without issues - Sometimes Apples can't get an IP address but will still connect to the AP's signal - Less often, PCs can't connect to the wifi (same as above - yes signal, no IP addy) - Don't let Raiders fans on no matter the time of day! My first thought was that the DHCP leases were all taken up when the Apples would try to connect, and it was just their unlucky timing, but I would then try to log on with a PC that had a new, unleased MAC address and it would work... Could this be something to do with interoperability between an apple wifi card, and the APs? Different parts of the DHCP lease being taken up first? The fact that the Seattle Mariners might actually be good this year?? If this hasn't used up everyone's patience (with my crappy sports jokes), something else I could use some help with: - We don't have the model or type of AP - This is because there is no documentation available for them, and they literally look like small white boxes with no writing on them. Also, the company that installed them is out of business, so the situation might be that no docs will ever be on the way. -- Do you guys have any ideas on how to figure out what we have? Thanks as always for all the help, and I'm looking forward to the day when I know enough to start contributing back to the site, Josh

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• Cisco QoS Guidance

  - by Kyle Brandt

  I have a 10M connection to the internet that is hooked into a 100M port. I am getting started with QoS, and am hopping for a little guidance on setting it up on a Cisco 3825 router. Right now I am going forward with the idea that I have to implement it on my router, and the provider can't provide QoS for me. How I envision it working is that the QoS will drop or queue packets on my router and that will help prevent a situation where the provider has to start dropping a lot of packets. Right now all I am tasked with is making sure that one of the 3 LANs gets a certain slice (say 3M for Gig Lan1) of the 10M internet connection (But ideally this will be more flexible in the Future). 10M Internet on 100M port on HWIC-4ESW +-----------------------+ | | Gig Lan1 | Cisco 3825 | Lan3 on HWIC-4ESW | | +-----------------------+ Gig Lan2 I need to learn more about QoS, but having a target technology and maybe example configuration will help me wrap my head around the reading I am doing a little more. Which Cisco QoS Technology do you recommend for this particular situation? Have a basic sample config of how this might work? Right now the 10M line is not congested, so this more to have something in place in case it starts to become mildly congested in the future. I do have VOIP at one location connected to this one over the Internet that goes through a VPN tunnel. Everything else that is between this location and other offices is on a separate MPLS network.

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• Trying to setup catchall mail forwarding on my rackspace's cloudspace server

  - by bob_cobb

  I'm running Ubuntu 12 Precise Pangolin and am trying to configure my server to catchall mail sent to it and forward it to my gmail address. I've been trying lots of examples online like editing my main.cf file which looks like this: smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = no # TLS parameters smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. myhostname = destiny alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = destiny, localhost.localdomain, localhost relayhost = smtp.sendgrid.net mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mailbox_size_limit = 51200000 recipient_delimiter = + inet_interfaces = all inet_protocols = all In my /etc/postfix/virtual I have: @mydomain.com [email protected] @myotherdomain.com [email protected] Which isn't working when I email [email protected] or [email protected]. So I got the recommendation to add the following to my /etc/alias: postmaster:root root:[email protected] restarted postfix, and tried emailing [email protected] or [email protected] but it still won't send. Does anyone have any idea what I'm doing wrong here? I'd appreciate any help.

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• Force local IP traffic to an external interface

  - by calandoa

  I have a machine with several interfaces that I can configure as I want, for instance: eth1: 192.168.1.1 eth2: 192.168.2.2 I would like to forward all the traffic sent to one of these local addresses through the other interface. For instance, all requests to an iperf, ftp, http server at 192.168.1.1 should be not just routed internally, but forwarded through eth2 (and the external network will take care of re-routing the packet to eth1). I tried and looked at several commands, like iptables, ip route, etc... but nothing worked. The closest behavior I could get was done with: ip route change to 192.168.1.1/24 dev eth2 which send all 192.168.1.x on eth2, except for 192.168.1.1 which is still routed internally. May be I could then do NAT forwarding of all traffic directed to fake 192.168.1.2 on eth1, rerouted to 192.168.1.1 internally? I am actually struggling with iptables, but it is too tough for me. The goal of this setup is to do interface driver testing without using two PCs. I am using Linux, but if you know how to do that with Windows, I'll buy it!

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• Router recommendation to virtualize 800 IPs

  - by delerious010

  I've recently been looking at getting some new load balancers for our environment as we are expecting to double our client base in the next 12 months. Currently we have 400 public IPS serving 800 clusters ( 2 clusters / IP due to ports ) on Coyote Point Balancers, and distributing connections to 3 web servers serving about 6GBytes outgoing, 2Gbytes in per day. If we double, this would be about 800 IPs, possibly 1600 clusters, and about 6 servers per cluster ( for a total of 9600 so called "real servers" using Barracuda's lingo ). Due to the amount of clusters, most solutions I've looked at ( Coyote, Barracuda, Loadbalancer.org ) seem to be unsure whether they'll be able to handle our planned growth, mostly due to health checks performed on the servers ... which makes total sense when you think of it. So the fine folk at loadbalancer.org recommended that we may be better off offload the 400-800 public IPs, which we require for SSL eCommerce solutions, over to a forward facing router. From that point on, the router could do some mangling to route EXT_IP:443 to INT_IP:INT_PORT which would then allow us to reduce the Load Balancer configuration to 1 or 2 clusters, thus resolving the health check problem. Does this idea make sense to yall ? Or would you have other recommendations to make ? Secondly, what router would you recommend for such an undertaking ? I'd be looking at something that has some form of failover mechanism built in. On a totally unrelated note, I've got to admit that I'm extremely pleased with the responses I got from loadbalancer.org. Their responses to my inquiries were surprisingly helpful ( i.e. I didn't feel as if I was taking to a sales guy trying to push something ). ( No I don't work for them, and sadly nor are they sending me free gear ).

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• IIS 7.5 FTP Service crashes after installation of Advanced Logging 1.0 Module

  - by Jeremy

  I've recently been tasked with setting up two new productions servers for an ASP.Net application. The servers sit behind a F5 Load Balancer, which in turn forwards the end users IP address forward via the standard X_Forwarded_For HTTP Header. All of the reading that I have done suggests that I need to install the IIS Advanced Logging Module in order to take advantage of the X_Forwarded_For HTTP Header. Some quick background: Both of the web servers are Windows 2008 R2 Standard (x64), with IIS 7.5 installed and configured. The FTP Role has also been installed, configured and is operational. The Issue After installing the IIS Advanced Logging module via the Web Platform Installer, I noticed the following Error in the Event Viewer: The FTP Service encountered an error trying to read configuration data from file \?\C:\Windows\system32\inetsrv\config\applicationHost.config, line number 374. The error message is: Unrecognized element 'advancedLogging' Trying to connect over FTP to either of the web servers results in a 530. I've spent 2 hours scouring Google trying to find a solution, short of uninstalling the Advanced Logging Module. As far as I can tell, there is no way to turn off Advanced Logging on a site per site basis. Help would be appreciated.

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• Cannot access domain from windows 2003 client

  - by Peuge

  Hey all, First off I am a novice at AD and DNS so please bear with me. This is my current situation: I have one server which is a DC and DNS server (win2k3) - Machine 1. I have another machine which is trying to join this domain - Machine2. This machine is also a win2k3 server. This is what I have done so far: I have setup DNS on the DC and its tcp/ip dns is pointing to itself. On machine2 I have set its dns to point to the dc. The DNS has been setup with a forward lookup zone with the same name as the domain (accdirect.com). I can ping machine1 from the machine2 by its FQDN and ip. I have set up forwarders on the DC for our ISP dns and can browse the internet on both machines. In the DNS mmc on the DC I can see a host (A) has been created for machine2. The problem is I still cannot join the domain. When I try join the domain via my computer - properties then it brings up the username/password box and after I go "ok" it says cannot find domain accdirect.com If I run this from machine2 dcdiag /s:accdirect.com /u:accdirect.com\admin /p: then I get the following: Performing initial setup: ** Warning: could not confirm the identity of this server in the directory versus the names returned by DNS servers. If there are problems accessing this directory server then you may need to check that this server is correctly registered with DNS [accdirect.com] Directory Binding Error 1722: Win32 Error 1722 This may limit some of the tests that can be performed. Done gathering initial info. On the dc all dcdiag and netdiag results pass. If anyone could help me I would really appreciate this! Sorry if any of my terminology is a bit off, I have only been doing this for two days. thanks Peuge

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