Aliased IPs

[Rick Stevens]

On Mon, 2006-01-09 at 11:58 -0700, redhat at buglecreek.com wrote:
> We have a server that that has a bunch of aliased IP addresses (eth0:1 -
> eth0:20).  When doing a reboot or "service network restart" all of the
> aliased ips show in the up condition with ifconfig, but when trying to
> ping some of them they do not respond.  When we manually do ifup eth0:5
> for example the interface starts responding.  If we do this to all the
> interfaces that initially do not respond they all seem to work fine. 
> Any clues as to why this is?  
> 
> System runs Redhat ES4 Update 2
> 
> Standard interface config file:
> DEVICE=eth0:5
> ONBOOT=yes
> BOOTPROTO=static
> IPADDR=xxx.xxx.xxx.xxx
> NETMASK=xxx.xxx.xxx.xxx
> GATEWAY=xxx.xxx.xxx.xxx

You can only have ONE gateway on an interface.  What's happening is
that the default gateway keeps getting wonked by the GATEWAY= stuff
in each config file.

You should set up a single GATEWAY= line in the /etc/sysconfig/network
file AND DELETE IT from all the
 /etc/sysconfig/network-scripts/ifcfg-ethx:y files.

> 
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- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
- VitalStream, Inc.                       http://www.vitalstream.com -
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-  Animal testing is futile.  They always get nervous and give the   -
-                             wrong answers                          -
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