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Full Discussion: Lose default gateway
Operating Systems AIX Lose default gateway Post 302916130 by bakunin on Sunday 7th of September 2014 11:58:54 AM
Old 09-07-2014
Quote:
Originally Posted by ariec
both machine connect to the same switch. after networking fault , one of the machines lost his default gateway !!!

what can be the reason ?
Whatever put the static route into place can be the culprit.

For instance: if you have the systems configured as a DHCP client they might have been provided with a default route by the DHCP server. If this didn't provide the default again after the network failure (for whatever reason) it might be lost.

Another possibility: the default route was configured with a "route add" command and this will not survive a reboot. Use chsys to put a default route in place which will survive a reboot.

There are more (less common) reasons but without more information it is not possible to find out.

Btw: we have a forum specializing in AIX. You might want to put AIX-related questions there.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
 

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routes(4)						     Kernel Interfaces Manual							 routes(4)

NAME
routes - Specifies Internet routing information to the routing tables SYNOPSIS
/etc/routes DESCRIPTION
Static routes can be defined in the /etc/routes file. The /etc/routes file identifies static routes that are automatically added to the network routing tables with the /usr/sbin/route add command. The /sbin/init.d/route script contains the /usr/sbin/route add command that is executed for each entry in the /etc/routes file when the network is restarted on the system or the system is rebooted. The general format of an entry in the /etc/routes file is: Dest Name1 Name2 The following is a brief description of each element in an /etc/routes file entry: A keyword that indicates whether the route is to a net- work or to a host. The two possible keywords are -net and -host. The name or address of the destination network or host. Name1 can be either a symbolic name (as used in the /etc/hosts or /etc/networks file) or an Internet address specified in dotted-decimal format. The name or address of the gateway host to which messages should be forwarded. Name2 can be either a symbolic name (as used in the /etc/hosts file) or an Internet address specified in dotted-decimal format. The routes file is a Context-Dependent Symbolic Link (CDSL) and must be maintained as such. See the System Administration manual for more information. EXAMPLES
To specify a route to a network through a gateway host with an entry in the /etc/routes file, enter: -net net2 host4 This example specifies a route to a network, net2, through the gateway host4. To specify a route to a host through a gateway host with an entry in the /etc/routes file, enter: -host host2 host4 This example specifies a route to a host, host2, through the gateway host4. To specify a route to a default gateway host with an entry in the /etc/routes file, enter: default 130.9.0.5 This example specifies a route to a default gateway with an Internet address of 130.9.0.5. FILES
Contains the /usr/sbin/routed add command. RELATED INFORMATION
Commands: route(8) Daemons: gated(8), routed(8) Files: gated.conf(4) Network Administration delim off routes(4)
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