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Author Topic: Strange problem connection hangs on SYN_RECV  (Read 3600 times)

plenque

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Strange problem connection hangs on SYN_RECV
« on: July 16, 2010, 11:20:23 AM »
Hi all...

Maybe someone can explain us what's happening. Behind a DIR-615 (10.1.1.1) we have a simple linux firewall and DMZ is configured on this IP (10.1.1.2). When we try to connect from the same network (10.1.1.0/24) to that machine on some machines (eg 10.1.1.103) we get an strange error. This only happens if the machines are connected to the DIR-615.

If from the machine (10.1.1.103) we send a "telnet 10.1.1.2 80" and we look at a netstat from the firewall (netstat -a -l) this is what we get:

tcp        0      0 10.1.1.2:http               10.1.1.103:58951            SYN_RECV

I can send what a "tcpdump host 10.1.1.103 -i eth1" outputs on 10.1.1.2.

Thank you very much.
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