Hello I have a question regarding default route on AIX servers. (I am using a p5 5.3 TL9 machine).
in my output of "lsattr -El inet0" I can see there are two routes like below.
route net,-hopcount,0,,0,x.x.207.7 Route True
route net,-hopcount,0,,0,x.x.202.129 Route True
But in netstat -nr
Route Tree for Protocol Family 2 (Internet):
default x.x.207.7 UG 106 50570580 en4 - -
127/8 127.0.0.1 U 14 1419976 lo0 - -
x.x.207.0 x.x.207.99 UHSb 0 0 en4 - - =>
x.x.207/25 x.x.207.99 U 2 607749 en4 - -
x.x.207.99 127.0.0.1 UGHS 2 471951 lo0 - -
x.x.207.127 x.x.207.99 UHSb 0 0 en4 - -
Here there is no entry in the table showing x.x.202.129.
My questions are:
How do I know if a route a persistant across reboots (how to Check without actually rebooting the machine :-0) . Because as per my understanding route added with "route add" command is not persistant and the same done with smitty is persistant across reboots.
Is it because there were no packet transfered t,hat there is no entry about x.x.202.129
There are several ways to make a route persistent. On AIX this usually means writing the information into the ODM. This is done with the mkdev/chdev commands (that are being used by SMIT but can also be used on commandline). With the lsattr command you query the ODM:
# lsattr -El inet0
shows you the routes that are defined in the ODM and thus will be active after reboot. The same information but in different format can be found by querying the ODM directly:
# odmget -q attribute=route CuAt
The route command itself however can be used for the same purpose just by adding an entry into the /etc/rc.net. This would lead to a 'permanent' route but without a trace in the ODM.
As to your second question: from the inet0 information there should be 2 default routes. As the netstat output just shows one I would think that the missing default route was removed by the route command. However, it will be back after a reboot. Best to remove it from the ODM if you don't need it.
If the routes are in ODM, they will be configured at boot. You can configure these routes anytime with "mkdev -t inet".
However, the "x.x.202.129" route is not valid for en4, since that interface is on a different subnet. Gateways must be directly reachable (i.e., on the same subnet) from a local address.
The lsattr command looks up information in the AIX ODM. It does not change anything so you may use it anytime. The ODM is basically a database containing information about your server's hardware and device configuration.
I got your private message and I'd like to welcome you to this great AIX forum. However, I (as probably most other forum users) won't answer AIX questions by private message or by email as that would disrupt the flow of information in this forum. So best to always place questions in the forum directly.
In the command , lsattr -E -l inet0 I guess inet0 stands for Ethernet
How to know , which ethernet is our system using.
Is inet0 , a default for any production server ( I mean the server on which the applications are running) or can there be something like inet1 or inet2 etc
In that case how to find the ethernet address.
The inet0 device contains (among other) information about the systems hostname and its default route. However, to find out about the server's TCP/IP address(es) you need to look up the configuration of the "en" devices. Use
ifconfig -a
to find out how TCP/IP is configured on your system. Then use
lsattr -El en0
and/or
lsattr -El ent0
to see the device configuration information stored in the ODM. For a start these commands should return the information you are looking for.
So best to always place questions in the forum directly.