Date: Mon, 05 Jan 1998 20:04:42 +0000 From: Karl Pielorz <kpielorz@tdx.co.uk> To: isp@freebsd.org Subject: Ifconfig & 2nd IP address - weird... Message-ID: <34B13CDA.AF845AFD@tdx.co.uk>
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Hi All,
If I do the following on my BSD box (to serve as a secondary IP for a virtual
web-server):-
ifconfig de0 192.168.100.2 alias
"ifconfig -a" then shows:-
de0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 192.168.100.1 netmask 0xffffffe0 broadcast 192.168.100.31
inet 192.168.100.2 netmask 0xffffffe0 broadcast 192.168.100.31
ether 00:00:c0:eb:a3:0b
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet 127.0.0.1 netmask 0xff000000
etc...
(netmask should be 255.255.255.224 - which the above seems to be - this puts
me on a net of 30 hosts...)
I can ping the .2 address fine from other machines, but I can't ping that
address from the machine itself...
I've checked the arp table - which shows the ARP for 192.168.100.2 as being
'incomplete', but even if I manually edit the arp table and put the right
ethernet address in there - the machine can't ping itself on the 2ndry IP
address...
I'm running ipfw but with 'add allow all from any to any' as the only rule,
and I'm also running 'gateway_enable="YES"' in my rc.conf...
netstat -r shows:-
192.168.100.1 0:0:c0:eb:a3:b UHLW 1 1008 lo0
192.168.100.2 link#2 UHLW 0 2
If I'm really unlucky (i.e. after a while) I get:
(root) caladan>ping 192.168.100.2
PING 192.168.100.2 (192.168.100.2): 56 data bytes
ping: sendto: Host is down
ping: wrote 192.168.100.2 64 chars, ret=-1
ping: sendto: Host is down
ping: wrote 192.168.100.2 64 chars, ret=-1
ping: sendto: Host is down
ping: wrote 192.168.100.2 64 chars, ret=-1
Though other external machines continue to ping it fine... :-( (Traceroute
displays the same info - host is down).
The system's running 2.2.2-RELEASE... - and also has 1 other interface, "fxp0"
- which works fine - and only has 1 IP address bound to it...
Any suggestions? (I'm sure this is something simple & silly ;-)
Regards,
Karl Pielorz
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