topic Re: Configuring Multiple Default Gateways in Operating System - HP-UX

Configuring Multiple Default Gateways

mr_red — Wed, 10 Oct 2012 12:34:25 GMT

Hi all!

I have an HP-UX 11iv3 with two network interfaces, each one is connected to a vlan.

Let's say:

lan0 - 10.10.70.38 netmask 255.255.255.0

gateway is: 10.10.70.254

and

lan1 - 192.168.7.126 netmask 255.255.255.0

gateway is: 192.168.7.1

I've configured gateways via SMH and i double checked the config in /etc/rc.config.d/netconf.

The problem is that the servers respond on just one gateway and not the other.

I've googled a bit and I've found that this can be resolved using iproute utility but that's for LINUX systems

(check out this blog, that's exactly the configuration that I need to set up configuring-multiple-default-routes-in-linux ).

Can someone tell me the alternative of this iproute2 in HP-UX or explain to how to configure two default gateways on the server each one on a seperate network interface.

Thanks!

Re: Configuring Multiple Default Gateways

Torsten. — Wed, 10 Oct 2012 13:20:05 GMT

You probably need some entries like this in your netconf file:

ROUTE_DESTINATION[0]="net 192.6.12.192"
ROUTE_MASK[0]="255.255.255.224"
ROUTE_GATEWAY[0]="192.6.12.130"
ROUTE_COUNT[0]="1"
ROUTE_DESTINATION[1]="net 192.6.12.33"
ROUTE_MASK[1]="255.255.255.240"
ROUTE_GATEWAY[1]="192.6.12.131"
ROUTE_COUNT[1]="1"

Re: Configuring Multiple Default Gateways

Matti_Kurkela — Wed, 10 Oct 2012 15:52:16 GMT

See pages 10-15 of this excellent document by Olivier S. Massé:

http://mayoxide.com/presentations/Understanding_hpux_routing.pdf

It describes this common behavior on multi-homed hosts, its root cause and some ways to fix it on HP-UX.

If you really need both network interfaces to have world-wide connectivity, you'll probably need the ip_strong_es_model setting described on page 13.

But if at least one of your NICs only needs to connect to a small number of network segments, setting up segment-specific route entries (like Torsten suggested) might be appropriate.

Re: Configuring Multiple Default Gateways

mr_red — Fri, 12 Oct 2012 22:42:25 GMT

Thank you very much Matti. It the document was very helpful and solved my problem.