well, go and search for the firewalls on the way now.
with a clear conscience.
:)



Taylan Yetkin wrote:
> 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
>


assuming your interface of question is eth0:
tcpdump -vvv -i eth0 -w results.tcpdump ip6

this will run as much as you want, and  will print how many packets has it got, 
once in a while.

when you have enough, you stop it with ^C, and go and watch the results of the 
capture via wireshark, or ethereal or any other graphical tool.

regards.





> 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.
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>
>>>>
>>>
>>
>>
> 


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