Gateway

[Jonathan Caplette]

Hi guys...

I have another question... If I change the gateway on a HP-UX 10.20 box, do I have to reboot the system?? Cause I've the gateway on my boxes and since that, it seems that all the IP packets are taking the older gateway... Is this because HP-UX keep a routing tables of all the route it takes or something like that???

How can I solve my problem???

Thanks Jonathan

[Kurt Beyers.]

You can change the gateway without rebooting the system.

Kurt

[Frederic Sevestre]

Hi,

Try "route delete" command to delete all entries about your old gateway. Then route add to add the new gateway.
See man route.
You don't need to reboot the system.

Regards.

Fr??d??ric

[Jonathan Caplette]

Ok.. but how can I see all the route in the route table???

[Wilfred Chau_1]

To see the route table, you can
# netstat -rn

[Patrick Wallek]

# netstat -r

or

# netstat -rn

Will show you your routing table entries. The only difference between the 2 commands is the -rn option will show all entries as IP addresses(n = numeric), whereas the -r option alone will attempt to resolve IP addresses to hostnames and will show hostnames if possible.

[Jonathan Caplette]

OK I see... I have a route that says:

default UG 0 8824 lan0

the ip address is my old gateway... do I change it with the route add/delete commands???

[Darrell Allen]

Hi Jonathan,

One thing not mentioned yet. If you change routes "on the fly" (which is perfectly fine), you will lose them when the system is rebooted unless you modify /etc/rc.config.d/netconf.

In netconf, you should have something like the following for your default gateway / route:

ROUTE_DESTINATION[0]=default
ROUTE_MASK[0]=""
ROUTE_GATEWAY[0]=xxx.xxx.xxx.xxx
ROUTE_COUNT[0]=1
ROUTE_ARGS[0]=""

Substitute your default gateway IP address for xxx.xxx.xxx.xxx

Also, be careful what you name backup netconf files. Most are skipped when booting but some could be executed (based on their name). I think it best to put backup copies of netconf in another directory. The same goes for any files in /etc/rc.config.d that you make a backup of.

Darrell

[Darrell Allen · Accepted solution]

route delete default

route add default 1

The "1" at the end of the route add command signifies the gateway is 1 routing hop away.

Darrell

[MANOJ SRIVASTAVA]

Hi Jonathan

netstat -nr

will give the current binding of the default gateway .

you can

route delete

route add < the new gateway >

You dont have to reboot or even restart network services.


Manoj Srivastava

[pap]

Hi,
Yes, You can change GATEWAY on your HP-UX system without rebooting it.

Please follow the procedure below for that.

1. edit /etc/rc.config.d/netconf file and put the required value for your new gateway in it. Remove the old gateway if you do not require it.

2. simply run following commands.

/sbin/init.d/net stop
/sbin/init.d/net start.

3. Now you can check your new gateway/route using following command

netstat -rn

Now you are all set and new gateway is now on use.

Thanks,
-Piyush.

[pap]

Hi,
Hope your problem must be resolved by this time.
Please assign points to all participants...:)...

Thanks,
-pap

[Jonathan Caplette]

Thanks all of you guys...

I did a route delete/add on the default entry and then a net stop/start... everything's fine now...

ciao!!

P.S. to pap: I never forget to assign point to the repliers, it's just that i'm in a rush these days... And remember the essence of the forum, it's to share knowledge with other and not to get points... ;)