How to accept RADIUS traffic on multiple interfaces?

[Kurt Hillig]

We're running FreeRadius 2.2.0 on RHEL 6.

The servers are working fine with a single active interface (eth0) on
each one; but we need to activate a second interface (eth1) on each
server - on a different IP subnet - to handle local traffic on that subnet.

The interfaces look like this:

eth0      Link encap:Ethernet  HWaddr 18:03:73:EE:76:96
          inet addr:10.10.0.189  Bcast:10.10.0.191  Mask:255.255.255.248
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

eth1      Link encap:Ethernet  HWaddr 18:03:73:EE:76:98
          inet addr:10.10.95.62  Bcast:10.10.95.127  Mask:255.255.255.128
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

and the routing is correct:

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
10.10.0.184     0.0.0.0         255.255.255.248 U         0 0          0 eth0
10.10.95.0      0.0.0.0         255.255.255.128 U         0 0          0 eth1
0.0.0.0         10.10.0.185     0.0.0.0         UG        0 0          0 eth0

Iptables is set up to accept incoming traffic from anywhere on UDP
ports 1812 and 1813.

radiusd.conf includes these "listen" sections (omitting comments):

listen {
        type = auth
        ipaddr = *
        port = 1812
        interface = eth0
}
listen {
        type = auth
        ipaddr = *
        port = 1812
        interface = eth1
}

listen {
        type = acct
        ipaddr = *
        port = 1813
        interface = eth0
}
listen {
        type = acct
        ipaddr = *
        port = 1813
        interface = eth1
}

But radiusd isn't seeing any of the inbound RADIUS traffic on eth1 -
tcpdump shows it coming in, but "radiusd -X" shows no indication of
this traffic (but is reporting all of the traffic on eth0).


Anyone know what I'm missing here?


--
                           Dr. Kurt Hillig
  UMNet Administration    I always tell the  (734)647-8778 desk
 University of Michigan    absolute truth,   (734)323-2736 cell
Ann Arbor, MI  48105-3640   as I see it.   khillig(at)umich.edu

> Computers were invented to help people waste more time faster <