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. >>>>> >>>>> >>>> >>>> >>> >> >> > -- Maxim Kovgan, Distributed Systems and Data Mining Laboratory Computer Science, Technion http://dsl.cs.technion.ac.il