I couldn't find how to capture ipv6 packets but I disabled it to see if it makes any difference. Actually I still get the same cvs [login aborted]: connect to neutralino.physics.uiowa.edu(128.255.34.167):2401 failed: No route to host message. telnet is also giving similar problem: telnet neutralino.physics.uiowa.edu 2401 Trying 128.255.34.167... telnet: Unable to connect to remote host: No route to host : Maxim kovgan wrote: > Can you try and capture any ipv6 packets trying to leave your computer > when you're trying to login into cvs or to do other things with cvs ? > > > IF you find anything running, disable ipv6. > (refer to your distribution's manual on how to do this.) > > Cheers. > > > > > Taylan Yetkin wrote: >> Hi, >> ifconfig in the host returns: >> >> eth0 Link encap:Ethernet HWaddr 00:19:D1:25:1F:C9 >> inet addr:128.255.34.167 Bcast:128.255.35.255 >> Mask:255.255.252.0 >> inet6 addr: fe80::219:d1ff:fe25:1fc9/64 Scope:Link >> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 >> RX packets:190785 errors:0 dropped:0 overruns:0 frame:0 >> TX packets:55961 errors:0 dropped:0 overruns:0 carrier:0 >> collisions:0 txqueuelen:100 >> RX bytes:57983176 (55.2 MiB) TX bytes:11357915 (10.8 MiB) >> Base address:0xecc0 Memory:dffe0000-e0000000 >> >> lo Link encap:Local Loopback >> inet addr:127.0.0.1 Mask:255.0.0.0 >> inet6 addr: ::1/128 Scope:Host >> UP LOOPBACK RUNNING MTU:16436 Metric:1 >> RX packets:5670 errors:0 dropped:0 overruns:0 frame:0 >> TX packets:5670 errors:0 dropped:0 overruns:0 carrier:0 >> collisions:0 txqueuelen:0 >> RX bytes:10405386 (9.9 MiB) TX bytes:10405386 (9.9 MiB) >> >> while netstat -nr returns >> >> >> Kernel IP routing table >> Destination Gateway Genmask Flags MSS Window >> irtt Iface >> 128.255.32.0 0.0.0.0 255.255.252.0 U 0 >> 0 0 eth0 >> 169.254.0.0 0.0.0.0 255.255.0.0 U 0 >> 0 0 eth0 >> 0.0.0.0 128.255.32.1 0.0.0.0 UG 0 >> 0 0 eth0 >> >> >> Taylan >> >> >> >> Maxim kovgan wrote: >>> Taylan Yetkin wrote: >>>> Both ping and traceroute the host from fermi machines returns >>>> success. I need some time to understand the use of tcpdump. >>>> thanks, >>>> Taylan >>> >>> can you post your ifconfig of the listening interface ? >>> >>> >>> a routing table would be nice too: >>> netstat -nr >>> >>> you can of course scramble the IP addresses. >>> >>> >>> >>>> >>>> Maxim kovgan wrote: >>>>> John Summerfield wrote: >>>>>> Maxim kovgan wrote: >>>>>>> John Summerfield wrote: >>>>>>>> Taylan Yetkin wrote: >>>>>>>>> Hi, >>>>>>>>> I installed a cvs repository in my local SL machine and trying >>>>>>>>> to connect >>>>>>>>> it >>>>>>>>> from fermi machines. I get the following error: >>>>>>>>> >>>>>>>>> [cmswn085> cvs login >>>>>>>>> Logging in to >>>>>>>>> :pserver:[log in to unmask]:2401/var/lib/ >>>>>>>>> cvsroot >>>>>>>>> CVS password: >>>>>>>>> cvs [login aborted]: connect to >>>>>>>>> neutralino.physics.uiowa.edu(128.255.34.167):2401 failed: No >>>>>>>>> route to hos >>>>>>>>> t >>>>>>>> >>>>>>>> This is a routing/firewall problem. the cvs command asks for >>>>>>>> the password before trying to connect. >>>>>>>> >>>>>>>> 07:02 [summer@numbat ~]$ cvs -d >>>>>>>> :pserver:anoncvs@localhost:2401/var/lib/ login >>>>>>>> Logging in to :pserver:anoncvs@localhost:2401/var/lib >>>>>>>> CVS password: >>>>>>>> cvs [login aborted]: connect to [localhost]:2401 failed: >>>>>>>> Connection refused >>>>>>>> 07:03 [summer@numbat ~]$ >>>>>>> >>>>>>> It's most probably tcpwrappers >>>>>> >>>>>> No. That allows a connexion, then rejects it. You don't get "no >>>>>> route" or "refused messages." >>>>> >>>>> AFAIK tcpwrappers refuse too. >>>>> but I somehow missed the no route to.. :) >>>>> and you're right! it needs some investigation: >>>>> >>>>> 1. ping to the host >>>>> 2. traceroute to the host. >>>>> >>>>> if you sporadically get the no route problem, it means you have >>>>> ... a routing problem :) >>>>> >>>>> after you finished up with it, you can continue and trouble shoot. >>>>> routing problem can be cause by your university/enterprise >>>>> firewall too. >>>>> >>>>> >>>>> you can also investigate with tcpdump, which is a great sniffer. >>>>> >>>>> Good luck! >>>>> >>>>> >>>>> >>>>>> >>>>>> "reset" is more probable. >>>>>> >>>>>> >>>>> >>>>> >>>> >>> >>> >> > >