Date: Thu, 7 May 1998 10:41:04 -0700 (PDT) From: Doug White <dwhite@gdi.uoregon.edu> To: Clod Baldrick <baldrick@rmsq.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Bizarre routing problem Message-ID: <Pine.BSF.3.96.980507104010.22550G-100000@gdi.uoregon.edu> In-Reply-To: <Pine.BSF.3.95q.980507111019.26243A-100000@corsair>
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On Thu, 7 May 1998, Clod Baldrick wrote: > lancaster$ ping tomcat > PING tomcat (130.13.21.92): 56 data bytes > > tomcat# tcpdump -i ed2 host lancaster and not host corsair > tcpdump: listening on ed2 > 11:02:42.566674 lancaster > tomcat: icmp: echo request > 11:02:42.566746 tomcat > lancaster: icmp: echo reply > 11:02:42.626639 lancaster > tomcat: icmp: echo request > 11:02:42.626692 tomcat > lancaster: icmp: echo reply > 11:02:43.566685 lancaster > tomcat: icmp: echo request > 11:02:43.566749 tomcat > lancaster: icmp: echo reply > 11:02:43.626636 lancaster > tomcat: icmp: echo request > 11:02:43.626688 tomcat > lancaster: icmp: echo reply > 11:02:44.566655 lancaster > tomcat: icmp: echo request > 11:02:44.566717 tomcat > lancaster: icmp: echo reply > 11:02:44.626606 lancaster > tomcat: icmp: echo request > 11:02:44.626659 tomcat > lancaster: icmp: echo reply > 11:02:45.566578 lancaster > tomcat: icmp: echo request > 11:02:45.566641 tomcat > lancaster: icmp: echo reply > 11:02:45.626568 lancaster > tomcat: icmp: echo request > 11:02:45.626620 tomcat > lancaster: icmp: echo reply > ^C > 92 packets received by filter > 0 packets dropped by kernel > > If I read this right, packets from lancaster are successfully getting > through to tomcat, which is correctly sending out ICMP responses. But > these responses don't get through to lancaster. And when tomcat pings > lancaster, the ICMP echo requests don't get through either. That seems to > account for the symptoms we're seeing. Yeah, sounds like someone has a filter on blocking icmp. > That probably means that the problem is with Linux. So does anyone have > any suggestions before I go off and ask in a Linux forum? Make sure that there aren't any firewall rules blocking icmp. Doug White | University of Oregon Internet: dwhite@resnet.uoregon.edu | Residence Networking Assistant http://gladstone.uoregon.edu/~dwhite | Computer Science Major To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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