ip aliases vs subnets on RH9

Did something change in the way IP aliases are handled in a recent
RedHat 9 update? I've been running a tftp server, syslog and a
few other things on a secondary IP address (eth0:1) for a long time.
The 2nd address is on the same subnet as the primary address
and is just used to make it easier to move the service to different
machines without changing DNS and updating firewall filters.

Before a recent update it would accept connections coming
across routers from other subnets as well as from the local
subnet. Now the eth0 address continues to work normally
but the eth0:1 address simply ignores packets that have been
routed from another subnet. Tcpdump shows packets
arriving, but xinetd waits in select() without noticing them.
Even pings to the address are only seen if they originate
on the local subnet. There are no ipchains/iptables
firewalls involved and nothing in hosts.allow/hosts.deny.

I'm not sure what changed in the last update but it's running
kernel 2.4.20-24.9smp now. Is there some configuration
change that will make the alias address work normally
again?

This looks right to me:

[root@monitor root]# ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:A0:C9:FB:57:A4
inet addr:10.207.192.11 Bcast:10.207.195.255 Mask:255.255.252.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:23822915 errors:0 dropped:0 overruns:0 frame:0
TX packets:29635633 errors:0 dropped:0 overruns:21 carrier:0
collisions:0 txqueuelen:100
RX bytes:458576344 (437.3 Mb) TX bytes:3543599948 (3379.4 Mb)
Interrupt:10 Base address:0x1060 Memory:fa104000-fa104038

eth0:1 Link encap:Ethernet HWaddr 00:A0:C9:FB:57:A4
inet addr:10.207.192.50 Bcast:10.207.195.255 Mask:255.255.252.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:23822915 errors:0 dropped:0 overruns:0 frame:0
TX packets:29635633 errors:0 dropped:0 overruns:21 carrier:0
collisions:0 txqueuelen:100
RX bytes:458576344 (437.3 Mb) TX bytes:3543599948 (3379.4 Mb)
Interrupt:10 Base address:0x1060 Memory:fa104000-fa104038

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Les Mikesell
(E-Mail Removed)




Les Mikesell