Greetings again. I have a multihomed box. The /etc/ifconfig.fxp0 starts out:

inet a.b.c.39 netmask 255.255.255.224 media autoselect
inet a.b.c.40 netmask 255.255.255.224 alias
inet a.b.c.41 netmask 255.255.255.224 alias
  . . .

where "a.b.c" is the first three octets of my address. 'ifconfig -a' reports:

fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
         address: 00:b0:d0:de:5d:de
         media: Ethernet autoselect (10baseT)
         status: active
         inet a.b.c.39 netmask 0xffffffe0 broadcast a.b.c.39.63
         inet alias a.b.c.40 netmask 0xffffffe0 broadcast a.b.c.39.63
         inet alias a.b.c.41 netmask 0xffffffe0 broadcast a.b.c.39.63
  . . .
lo0: flags=8009<UP,LOOPBACK,MULTICAST> mtu 33228
         inet 127.0.0.1 netmask 0xff000000
         inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
         inet6 ::1 prefixlen 128
  . . .

When logged in with telnet, I can ping a.b.c.39 and 127.0.0.1 just 
fine. When I try to ping (or access in any other way) a.b.c.40, .41, 
and so on, I get no connection. I can ping and access those addresses 
just fine from boxes on the Internet.

How can I access my aliased IP addresses from this box?

--Paul Hoffman