Arping loopback question.

Hello all.

Quick question here about an arping loopback adaptor. I've set lo to noarp, and I've set /proc/sys/net/ipv4/conf/lo/hidden to 1. The interface still arps for lo:0. I'm using Foundry server irons, and I need to set the loopback interface in order for load balancing to work properly.

After I clear the arp tables on my switches, and then ping the loopback, I get the coresponding arp entry

sh arp
...
192.168.5.100 00:A0:CC:73:3F:4D
...

Here's the output from ifconfig.

eth1 Link encap:Ethernet HWaddr 00:A0:CC:73:3F:4D

          inet addr:192.168.5.90  Bcast:192.168.5.255
Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:173056 errors:0 dropped:0 overruns:0 frame:0
          TX packets:132075 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          Interrupt:18

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING NOARP MTU:3924 Metric:1 RX packets:33536 errors:0 dropped:0 overruns:0 frame:0 TX packets:33536 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0

lo:0 Link encap:Local Loopback
inet addr:192.168.5.100 Mask:255.255.255.255 UP LOOPBACK RUNNING NOARP MTU:3924 Metric:1

I'm using 2.2.18pre22. eth1 is NetGear Gig-E adapter compiled into the kernel. eth0 is an eepro100 compiled into the kernel.

Any ideas here?

Thanks in advance.

-sb

Scott Bisker
Lead System Engineer
e24/7 Inc.

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