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From: steven@shellnet.co.uk (Steven Fletcher)
To: freebsd-questions@FreeBSD.ORG
Subject: ifconfig difficulties
Date: Mon, 10 Aug 1998 17:27:26 GMT
Organization: Shellnet
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Hello all.

I've been using ifconfig for a long time to alias IP addresses to my
network card. The command I use is:

ifconfig de0 inet <IP alias address> alias

And then I am able to ping this IP address from any computer on our
network and any external computer. However, if the aliased IP is on
our first class-c, the same class-c block as the base IP is on, I
cannot ping the IP - I recive a "sendto: Host is down" error.

But, if the aliased ip is not on the same class-c as the base ip,
pings are successfull.

example:

ifconfig de0 shows:

de0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
      inet 194.129.209.11 netmask 0xffffff00 broadcast 194.129.209.255
      inet 194.128.147.15 netmask 0xffffff00 broadcast 194.128.147.255
      inet 194.129.209.19 netmask 0xffffff00 broadcast 194.129.209.255
      ether 00:c0:f0:16:1e:4c
      media: autoselect (10baseT/UTP) status: active

I telnet into the box (194.129.209.11 is the base IP) and I am able to
ping 194.128.147.15. But if i ping 194.129.209.19, I have no such
luck.

Would anyone be able to give the the likley cause of the error or what
perhaps I am doing wrong here?

TIA,

-Steven Fletcher (steven@shellnet.co.uk)
Shellnet - http://www.shellnet.com/

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