On Thu, 08 Sep 2005 10:05:25 -0700 Ben Greear <greearb@xxxxxxxxxxxxxxx> wrote: > Alex Zeffertt wrote: > > Hi list, > > > > I've discovered a strange problem. I've got two hosts with tagged interfaces called eth0.5. > > When I try to telnet from host1 to host2 the session hangs where it should print out "Login:". > > I have no problems pinging host2 from host1 - even if I use max payload frames! > > > > I've run tcpdump -i eth0.5 on host1 when trying to telnet to host2, and I've copied the output > > to the end of this email. It would seem that host2 (192.168.5.254) responds okay to the initial > > SYN with a SYN/ACK. host1 (192.168.5.1) then sends some data and host2 then correctly ACKs > > this. But then host2 starts sending packets which have the first 10 bytes stripped! > > > > I don't know why host2 is sending these packets. However, it *is* running old software > > (linux-2.4.4) and I have found that if I replace it with a host running later software > > (linux-2.4.25) and create eth0.5 on this new host, then I have no problem telnetting into it. > > The vlan code in 2.4.4 is probably crufty as hell...it was not even officially in the > kernel untill 2.4.15 or so... > > If you really need to use a kernel that old, I'd back-port the VLAN code from the latest 2.4 > kernel. > > Ben > Hi Ben, Looking back through our CVS logs it appears that it was the vlan.1.5 patch that I applied. Do you think this particular release is "crufty"? :-p I'll have a go at backporting, like you say. Here goes... deep breath... Alex
