Server stops responding

broadcast · 09-02-2006, 07:45 AM

Hello,
I have RedHat

Code:

#uname -a
Linux whatever 2.6.9-42.0.2.ELsmp #1

this server is updated and it is running mail application.
all the sudden server stopped responding to external requests, yet it was responding fine and all seems to be working correctly when am working on the server.
by restarting the network service

Code:

#service network restart

everything went back to normal and server started responding normaly
i suspected that it is a routing issue correct me if am wrong
i have 3 NIC's configured with network ranges as follows
eth0 172.16.30.2 - 172.16.30.254
eth1 10.10.1.10
eth2 172.16.31.2 - 172.16.31.254

eth0 ip = 172.16.30.1
eth2 ip = 172.16.31.1

only eth0 is configured for defualt gateway
the output of netstat -nr is as follows

Code:

Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
10.10.0.0       0.0.0.0         255.255.0.0     U         0 0          0 eth1
172.16.0.0      0.0.0.0         255.255.0.0     U         0 0          0 eth0
172.16.0.0      0.0.0.0         255.255.0.0     U         0 0          0 eth2
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth2
0.0.0.0         172.16.0.1      0.0.0.0         UG        0 0          0 eth0

what do you think wasw the reason for this kind of behavior

thank you

MensaWater · 09-02-2006, 09:30 AM

You always have only one "default" gateway. Your "default" is 0.0.0.0

Notice that all your other destinations are using 0.0.0.0 as their gateway. This is normal.

As to why you had to restart networking it's not clear. Providing ifconfig and netstat output prior to restart next time might give a clearer picture.