[NTLUG:Discuss] eth0:1 alias not pinging

[Patrick R. Michaud]

On Fri, Sep 01, 2006 at 02:27:36PM -0500, Neil Aggarwal wrote:
> Hello:
> 
> I have a machine running on a T1 line from Xspedius.
> 
> When I installed the machine, I used the first IP I was
> assigned (209.12.138.18) on the eth0 interface.
> 
> Now, I want to add the two additional IP addresses
> as aliases eth0:1 and eth0:2.
> 
> I issued these commands:
> 
> /sbin/ifconfig eth0:1 209.12.138.19 netmask 255.255.255.240 broadcast
> 209.12.138.31
> /sbin/ifconfig eth0:2 209.12.138.20 netmask 255.255.255.240 broadcast
> 209.12.138.31
> 
> Everything looks fine.  ifconfig gives me:
> [...]
> 
> I can ping 209.12.138.18 from the outside world, but not .19 or .20.
> 
> I called Xspedius and they told me that everything is set correctly on their
> side.
> 
> I checked the firewall rules, it is set to allow all incoming icmp.
> 
> Did I forget something or is Xspedius misleading me?

You might try briefly turning off the firewall altogether, just to 
verify that it's not some other firewall rule or interaction that is
blocking things.  

Also, out of curiosity, what do your routing tables look like?

Pm