Changing the default route
 
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Author Topic: Changing the default route  (Read 4754 times)
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JazzyG
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« Reply #13 on: April 11, 2007, 04:44:42 PM »
The easiest way to change the default route is to do the following:

1. Use smitty route->Remove Static Route or issue the route -f to flush the routing table.

2. You should see output to the screen informing you that routes are being removed.

3. Then issue the netstat -rn command. You should not see the default in the routing table.

4. Issue the smitty mkroute command. This is pretty straight forward and it will it will add this default route to the ODM database and make it permanent even after a system reboot.

5. Issue another netstat -rn command, you should see your new default route.
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webmaster
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« Reply #12 on: November 13, 2006, 11:19:00 AM »
Quote from: mahdi on November 13, 2006, 07:09:03 AM

route         net,-hopcount,0,,0,10.40.0.2 Route                            True

This line states that AIX has one default route, and the router address is 10.40.0.2

If, after a reboot, you have an extra route defined, you will need to check for programs and/or scripts that are being executed by /etc/inittab. Dont forget the programs started via the rc.d mechanism.

And, considering HACMP - verify the start script(s) of the applications, and also HACMP event customization.
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mahdi
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« Reply #11 on: November 13, 2006, 07:09:03 AM »
/ # lsattr -El inet0
hostname      core1                        Host Name                        True
gateway                                    Gateway                          True
route         net,-hopcount,0,,0,10.40.0.2 Route                            True
bootup_option no                           Serial Optical Network Interface True
rout6                                      FDDI Network Interface           True
authm         65536                        Authentication Methods           True


And HACMP Version 5.1
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Michael
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« Reply #10 on: November 12, 2006, 11:20:39 AM »
please post the output of
lsattr -El inet0

If it isnt in there, then I'll try to think of other locations.

And, what version of HACMP are you using?

If the information is in the ODM standard editting is not recommended.
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mahdi
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« Reply #9 on: November 11, 2006, 06:56:50 AM »
the aix version is 5.1 ml4
i am searchinf to find the bad gateway on incorrect location as i said before ,i tried to search bad gateway with find command and find it ,but i can not find on which file and is it possible to edit file manully without damage to os files or no?
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nath
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« Reply #8 on: November 09, 2006, 02:58:50 PM »
What version of AIX?
Are you using etherchannel?

Try to set your default Gateway IP using "smit mktcpip"

Also look at lsattr -El inet0 for default gateway, and use chdev to change the Correct GW IP if the above didn't work
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Michael
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« Reply #7 on: November 09, 2006, 11:00:26 AM »
Did you do the lsattr command before the smitty command? Or only after?

If only after, the warning message is what I expected, as you had already removed the active route info.

To verify, you will need to do a reboot. If the 'bad' route returns, then the route is being added in a non-standard location.

I can help with that as well I expect, but first I need verification of the current situation.
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mahdi
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« Reply #6 on: November 09, 2006, 10:31:49 AM »
i did smitty netstat to delete 192.168.168.4 static route ,but return below message :

Command: failed        stdout: yes           stderr: no

Before command completion, additional instructions may appear below.

Method error (/usr/lib/methods/chginet):
        0514-009 Cannot delete an object from the device
                  configuration database.
0821-216 chginet: Cannot delete route (net,0,192.168.168.4) from CuAt.

/ # lsattr -El inet0 -a route
route net,-hopcount,0,,0,10.40.0.2 Route True


now what can o do



     
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Michael
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« Reply #5 on: November 09, 2006, 10:21:07 AM »
using smitty netstat you can delete individual static routes.

for destination enter either 0 (zero) or default, for router enter the address you want deleted (in your case 192.168.168.4)

As you have already deleted the entry from the kernel (live situation) you may get a warning/error message.

To verify before and after that the settings are removed:

lsattr -El inet0 -a route

an example output:
Code:
root@x054:[/var/spool/mail]lsattr -El inet0 -a route
route net,-hopcount,0,,0,192.168.129.124                                   Route True
route net,-hopcount,0,-netmask,255.255.255.0,,,192.168.1.0,192.168.129.100 Route True
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mahdi
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« Reply #4 on: November 09, 2006, 10:13:27 AM »
Hi
I said hacmp running ,because i can not remove device only,the route problem before the hacmp starts appear and not related to hacmp ,before the hacmp configured we have this problem and we must remove this routing from route table maunally but when the server start ( boot ) the old route come back

route table after booting:
/ # netstat -rn
Routing tables
Destination      Gateway           Flags   Refs     Use  If   PMTU Exp Groups

Route Tree for Protocol Family 2 (Internet):
default   10.40.0.2         UGc       0        0  en0     -   -
default   192.168.168.4 .....

and i deleted by:
route delete default 192.168.168.4

and the problem solve until next booting
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Michael
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« Reply #3 on: November 09, 2006, 09:02:33 AM »
the command to modify default routes is:

smitty netstat

But, as this is HACMP related I need to know which address this (and I am moving topic to HACMP area of forums)

Is this a service (application) address, standby, admin, etc. etc.

And, actually, you should not be doing this while HACMP is active. imho as HACMP instructor.

This is kind of like when they close the roads you are using everyday without telling you that the roads have changed - and also not mentioning which roads are now open to use.
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Michael
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« Reply #2 on: November 09, 2006, 08:58:15 AM »
I forgot to say that we are running HACMP on server and can not do rmdev or cfgmgr ,is it possible explain how can i find routing information where stored ( file )
i tried to search "192.168.168.4" pattern in all files on aix like :
find . -type f -exec grep -i 192.168.168.4 '{}' \; -print
but this command do not show which file contains this pattern
please let me more
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Michael
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« Reply #1 on: November 09, 2006, 08:36:12 AM »
If you are adding an interface, the easiest way to change all the settings is to use:
smitty mktcpip

If you still have 'console' access I recommend the following:
* as root
# rmdev -dl en0
# rmdev -dl inet0
# cfgmgr
# smitty mktcpip

Normally you would need only to use smitty (or smit) mktcpip, but this will first remove all configuration settings for an interface (assuming you are using en0), base tcpip settings (including all static routes); create new empty configuration objects; and then configure them.

Lastly, verify manually (vi /etc/hosts) that your hostname is not showing up twice in /etc/hosts with old and new IP address.

regards, Michael
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TestUser
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« on: November 09, 2006, 08:30:12 AM »
Hi
I have problem with routing table in aix,i have been changed ip address from 192.168.168.23 to 10.40.0.100 and need change default route ,i did it ,but when the server booted the old deafult gateway (192.168.168.4) back and create problem when client try to connect to server .
i can not find any file that may be has this ip address in it
please let me know how can fix this problem and delete old gateway from server ( which file must be check ) and can i use odm command and how?

regards,
Bashiri
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