Robert D'souza wrote:
Hi there,

After I just boot up my linux system, I am not able to connect to
machines in any other network other than my subnet. I can access all the
machines in my sub-net though.

Even if i restart my network once or twice there is no change in the
situation..but if I restart the network around 10-15 times.. it gets
allright..i tried everything to clear up this situation... and finally
gave up and put up a loop to restart the network around 50 times in my
bashrc, that sometimes clears up the network. Otherwise if I just sit
back and wait after around 10-15 minutes things are back to normal.

I am on a lan with around 50 systems mostly Win2K based, and around 5-6
linux machines. I have a Debian Woddy system and people on my network
with RHL9.0 are also facing the same problem, so it could be something to
do with the network.

My machine is dual boot and if I boot to Win2k there is no problem
whatsoever.

<snip>


Ok, this is interesting.

Can you send the output of, during the time things don't work:

#ip link show
#ip address show
#ip neigh show
#ip route show
#iptables -nL -v
#iptables -nL -v -t nat
#cat /proc/net/arp
#cat /proc/net/route
#tcpdump -nei eth0 host xxx.xxx.xxx.xxx or icmp
#lsmod

Also, a little description of the network setup, particularly:

-> What NIC are you using in you m/c? Are the m/cs with RHL9.0 using the same NIC?

-> What ethernet device is being used - switch or hub? Which make? If it's a switch, any exotic settings like L3/L4 filtering or VLANs?

-> Is the other NIC on the DNS box - the one with xxx.xxx.xxx.xxx IP, connected to the same hub/switch/VLAN? Or is it connected to an ISP?

-> Any exotic tunneling/firewalling/network encryption software being used on your network - particularly, on your m/c and/or the DNS box?

An ascii art diagram of the network would be nice.

Regards,
Varun Varma
---------------------------------------
Mindframe Software & Services Pvt. Ltd.
http://www.mindsw.com
---------------------------------------



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