Date: Mon, 12 Jan 2009 12:26:06 -0800 From: Jason Chambers <jchambers@ucla.edu> To: freebsd-net@freebsd.org Subject: Network is unreachable and other related errors Message-ID: <496BA75E.7020309@ucla.edu>
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Hello all, Wondering if anyone else experiences errors such as "Network is unreachable" and the like when using security auditing tools like nmap, nessus, etc. I found a PR from a long time ago that appears relevant but it was abandoned: http://www.freebsd.org/cgi/query-pr.cgi?pr=102741&cat= As a result of this condition some tools are completely unusable. A nessus scan returns all scanned hosts as dead seconds after starting a scan. Nmap is unable to scan a system because it immediately goes into a loop of the following: sendto in send_ip_packet: sendto(4, packet, 44, 0, xxx.xxx.xxx.xxx, 16) => Network is unreachable Offending packet: TCP xxx.xxx.xxx.xxx:55555 > xxx.xxx.xxx.xxx:80 S ttl=56 id=xxxx iplen=11264 seq=xxxx win=1024 <mss 1460> Sleeping 15 seconds then retrying sendto in send_ip_packet: sendto(4, packet, 44, 0, xxx.xxx.xxx.xxx, 16) => Network is unreachable Offending packet: TCP xxx.xxx.xxx.xxx:55555 > xxx.xxx.xxx.xxx:80 S ttl=56 id=xxxx iplen=11264 seq=xxxx win=1024 <mss 1460> Sleeping 60 seconds then retrying It's obviously related in part to the hardware configuration of a device however I'm not sure where to look next. The network controller does not seem to make a difference. So far I've not experienced anything related to this issue when running Linux on the same hardware. Any ideas where to look next ? Regards, --Jason
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