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Old 20th June, 2008, 05:52 PM
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Odd Ubuntu problem

I have a very strange ubuntu problem at the moment, that I've not been able to solve. Very basically, the Ubuntu box has a wireless card, and it can talk quite happily to anything on the local network.

However, try to talk to a system outside the local network, and everything falls apart. Yes, the default gateway is set correctly! Running TCPDump shows Syn going out, syn-ack coming back and ack going out. With an HTTP request, I can then see the HTTP request go out.. Then there's nothing for a while, but then a repeat of the syn-ack coming back, as if the remote server never saw the last part of the three way handshake.

Any ideas as to what the heck is going on?

Edit: It doesn't appear to affect FTP however. On the other hand, all the other systems on the network have no problems!
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Old 20th June, 2008, 08:27 PM
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That's odd. Whether it's HTTP or FTP shouldn't make any difference to the handshake sequence.

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Old 26th June, 2008, 03:33 PM
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It is odd, and I've no idea why it's happening...
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Old 26th June, 2008, 04:21 PM
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I ran across this in passing, don't know if it will do any good though.

HTTP Server Response Problems ... Web vs. LAN - Ubuntu Forums
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Old 26th June, 2008, 05:02 PM
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Unfortunately that particular issue relates to the way that NAT usually work - whereby you can't connect back to an internal service by going out through the gateway. The easiest way to deal with this is with split horizon DNS.

In my case, the servers are on the Internet rather than on the local network, so there no horizon issue.
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