Two machines, many configuration differences, I need to find which one
is causing this difference in behaviour:
Machine 1: (eth1 is on the correct 192.168.3.x network)
# ip neighbour add to 192.168.2.15 lladdr 00:0F:20:98:F8:86 nud \
reachable dev eth1
# cat /proc/net/arp
IP address HW type Flags HW address Mask
Device
192.168.0.4 0x1 0x2 00:00:F8:04:9B:69 * eth0
192.168.2.15 0x1 0x2 00:0F:20:98:F8:86 * eth1
192.168.2.148 0x1 0x2 00:10:A4:F2:CF:CB * eth1
# ip neighbour show
192.168.0.4 dev eth0 lladdr 00:00:f8:04:9b:69 nud reachable
192.168.2.15 dev eth1 lladdr 00:0f:20:98:f8:86 nud reachable
192.168.2.148 dev eth1 lladdr 00:10:a4:f2:cf:cb nud stale
Note that hand-created entry appears in /proc and ip .. show
Machine 2: (similarly correct network)
# ip neighbour add to 192.62.204.15 lladdr 00:0F:20:98:F8:86\
nud reachable dev eth1
IP address HW type Flags HW address Mask
Device
193.62.204.1 0x1 0x2 00:0F:20:98:F8:87 * eth1
# ip neighbour show
192.62.204.15 dev eth1 lladdr 00:0f:20:98:f8:86 nud reachable
193.62.204.1 dev eth1 lladdr 00:0f:20:98:f8:87 nud stale
Here, hand-created interface is in ip .. show, but missing from /proc
There is some reason to believe that the functional ARP behaves as
/proc/net/arp (ie the hand-created entry is ignored) but I don't have
absolute proof of that yet.
Machine 1 (works) is 2.6.12.2 hand compiled
Machine 2 (broken) is Ubunutu's 2.6.10-5-386, but this has possibly been
seen in Debian 2.6.16.2 as well.
Please could someone suggest where I look next?
Cheers,
Simon.
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