Date: Mon, 05 Jan 1998 17:14:29 -0600 From: Edwin Culp <eculp@ver1.telmex.net.mx> To: Karl Pielorz <kpielorz@tdx.co.uk> Cc: isp@FreeBSD.ORG Subject: Re: Ifconfig & 2nd IP address - weird... Message-ID: <34B16955.64BF3B38@ver1.telmex.net.mx> References: <34B13CDA.AF845AFD@tdx.co.uk>
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Karl Pielorz wrote: > > 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 TRY ifconfig de0 192.168.100.2 netmask 255.255.255.255 alias provecho ed > > "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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