Networking :: Failed Http And Telnet Connections To Dns Round Robin Servers

Dec 2, 2008

So we have DNS round robin set up for 4 servers. If we ping dns name (basically an alias) server_connect it resolves with different IP address in round robin format. I.E. x.x.x.1 x.x.x.2 for the 4 different server IP addresses. When we do nslookup server_connect it will come back first time as server1_connect server2_connect through server4_connect so the server is able to resolve through ping and nslookup resolving the initial dns name (alias) to the dns name associated in the round robin. Problem is when we try to connect with http or telnet it comes back host unrecognized. I can put one of the 4 round robin servers in /etc/hosts and it connects fine so I'm thinking that either one of three things.
1) ttl
2) It does double connection first to identify itself to the round robin server and then handshake but second time it hits for the handshake the IP and dns name is different than what it expected so it fails.
3) Since we are trying to telnet to dns alias and it is returning different dns name it fails.

2 and 3 seem most promising but now I'm at a stand still.Anyone else come across this issue and if so how did you resolve.

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Networking :: Port Bonding Won't Use Active-backup Using Round-robin?

Dec 9, 2010

I'm trying to configure my Red Hat server to use port bonding for two interfaces going to a switch, and I followed this redhat guide [URL]...-redhat-server but when I attempt to bring the bond up, it simply uses mode 0 (round robin) instead of mode 1, which I specifically configured in /etc/modprobe.conf by doing

Code:
options bond0 mode=1

Any ideas why the bond would continue to use round robin when I set it to active-backup?

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Apr 30, 2011

Here is the senario...

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My problem is that when I try and send an email that is part of the domain, it ends up trying to deliver it locally. I realize it is supposed to, but I don't want that for non-users of the server.

I want to be able to deliver certain emails []@mydomain.com remotely. (info@mydomain.com)

exim4 setup "internet site; mail is sent and received directly using SMTP". This works well as long as it is not an email from mydomain.com.

Is there a way to have exim check the users first and then deliver based on local user or not?

Next question. Is having the domain name as the hostname the best way to setup a round robin? (web server)

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Aug 4, 2010

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Nov 21, 2010

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Though I wonder, how I activated it, because I didn't do that...

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Mar 1, 2011

OK, so, basically, not so long ago I had a modem + LAN cable kind of internet setup, and my friends and colleagues had no problem connecting to my Apache, ircd, etc.

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All connections are done through WAN static IP (though test with netwide dynamic IP yield the same results =)

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nc -v www dot aalto dot fi 8080
HEAD / HTML/1.1
host: www dot aalto dot fi
And it returns:
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Content-Type: text/html
Last-Modified: Thu, 02 Sep 2010 12:46:01 GMT
[Code]....

I really don't know what does it mean. Question 2: Using netcat, nc(1), start a bogus web server listening on the loopback interface port 8080. Verify with netstat(, that the server really is listening where it should be. Direct your browser to the bogus server and capture the User-Agent: header "Direct your browser to the bogus server and capture the User-Agent: header" I don't understand this question.

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[code]....

Again, wget works, the file with authentication works, but wget calling the file with authentication does not work.

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[code]....

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[code]....

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