Hello list.
I'm running Mandrake 9.1, two NICs bonded to a single IP.
>From some reason, from time to time, computer starts to issue
a lot of ARP requests to non-existent IPs (that are still in
my subnet). I think that the same behaviour was observed with
a single NIC too.
ARP table gets filled very quickly, kernel issues
"Neighbour table overflow." and sometimes I cannot even
ping from above computer.
I googled a little and the only advice that I've found was
to define properly loopback interface. Output of ifconfig
and route attached at the end of this letter.
Now, the temporary solution that I've found was to increase
/proc/sys/net/ipv4/neigh/default/gc_thresh*.
Whats happening ?
Thanks,
Michael
~> route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 bond0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 172.17.1.10 0.0.0.0 UG 0 0 0 bond0
~> ifconfig
bond0 Link encap:Ethernet HWaddr 00:04:75:7C:EC:58
inet addr:172.17.4.10 Bcast:172.17.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1
RX packets:3251494 errors:0 dropped:0 overruns:1 frame:0
TX packets:3186099 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:368186039 (351.1 Mb) TX bytes:1070245144 (1020.6 Mb)
eth0 Link encap:Ethernet HWaddr 00:04:75:7C:EC:58
inet addr:172.17.4.10 Bcast:172.17.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:1630244 errors:0 dropped:0 overruns:1 frame:0
TX packets:1593125 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:196325918 (187.2 Mb) TX bytes:543229542 (518.0 Mb)
Interrupt:18 Base address:0xd880
eth1 Link encap:Ethernet HWaddr 00:04:75:7C:EC:58
inet addr:172.17.4.10 Bcast:172.17.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:1621250 errors:0 dropped:0 overruns:0 frame:0
TX packets:1592974 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:171860121 (163.8 Mb) TX bytes:527015602 (502.6 Mb)
Interrupt:20 Base address:0xd800 Memory:fe9fe000-fe9fe038
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:433764 errors:0 dropped:0 overruns:0 frame:0
TX packets:433764 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:24293226 (23.1 Mb) TX bytes:24293226 (23.1 Mb)
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