Re: 2 IP addresses in RH9

[Bob McClure Jr <robertmcclure earthlink net>]

On Fri, Oct 31, 2003 at 08:53:03AM -0800, Shawn McPike wrote:
> 1)  I just recently set up RH9.
> 2)  I have an external router/firewall that handles
> one-to-one NAT on my external IP addresses (i.e.
> EXTERNALIP1 --> 192.168.254.10 and EXTERNALIP2 -->
> 192.168.254.11).
> 3)  Both external IPs are registered domain names that
> I own (domainname.com)
> 4)  OK - here's the question... both of the mentioned
> internal IPs need to point to my linux machine.  I
> have 1 configured so far and here is the ifconfig for
> my single NIC:
> 
> eth0    Link encap:Ethernet  HWaddr 00:04:5A:64:62:51 
> 
>           inet addr:192.168.254.10 
> Bcast:192.168.254.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500 
> Metric:1
>           RX packets:13212 errors:0 dropped:0
> overruns:0 frame:0
>           TX packets:10375 errors:0 dropped:0
> overruns:0 carrier:0
>           collisions:0 txqueuelen:100 
>           RX bytes:12378958 (11.8 Mb)  TX
> bytes:2735929 (2.6 Mb)
>           Interrupt:11 Base address:0x4000 
> 
> 5)  not sure if this helps, but here is my IP routing
> table.
> 
> Destination     Gateway         Genmask         Flags 
>  MSS Window  irtt Iface
> 192.168.254.0   0.0.0.0         255.255.255.0   U     
>    0 0          0 eth0

You don't need the following line:

> 169.254.0.0     0.0.0.0         255.255.0.0     U     
>    0 0          0 eth0
> 127.0.0.0       0.0.0.0         255.0.0.0       U     
>    0 0          0 lo
> 0.0.0.0         192.168.254.254 0.0.0.0         UG    
>    0 0          0 eth0

I presume 192.168.254.254 is the internal address of your
firewall/router.

> 6)  So (A) how do I set up 192.168.254.11 on the same
> NIC??

You need to set up an alias:

http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/custom-guide/s1-network-aliases.html

> 7) And (B) I get messages on FQDN's not being
> configured: i.e when I start Apache:
> 
> Starting httpd: httpd: Could not determine the
> server's fully qualified domain name, using 127.0.0.1
> for ServerName

You should have an entry in /etc/hosts reflecting the external name
and the internal address, such as mine:

127.0.0.1       localhost.localdomain   localhost
192.168.2.4     yak.bobcatos.com        yak

> Thanks in advance!
> Shawn McPike

Cheers,
-- 
Bob McClure, Jr.             Bobcat Open Systems, Inc.
robertmcclure earthlink net  http://www.bobcatos.com
Man's disappointments are sometimes God's appointments.