AIX

Hello,

I am new to Unix and have been trying to configure an AIX server running 5.3. I used smitty or smit to configure interface 0 on the server. I am able to ping the IP I set, however I am still unable to ping the gateway. I configured the IP by navigating to Communications Applications and services then selecting TCP/IP then selecting the minimum configuration and startup and configuring interface en0 I entered all of the info required and then selected the start now option. I did not receive any errors in the output, but I am still unable to ping the gateway. Any help would be greatly appreciated. I will supply any other information required.

Thanks in advance:confused

Hi

Try this :“netstat -rn” and check the output.

If the machine has several network interfaces: are you sure you configured the one connected to the gateway? Probably you have configured an interface which isn't connected (yet).

I hope this helps.

bakunin

I configured en0 interface and I have a cable plugged into port 1 in the back of the server as there is only one nic installed with two interfaces and I have configured en0. Below is the output of the netstat -rn command.

Code:

#	netstat	-rn
Routing	tables
Destination	Gateway	Flags	Refs	Use	If	Exp	Groups

Route	Tree	for	Protocol	Family	2	(Internet):
default	10.52.44.1	UG	0	65	en0	-	-
10.52.44.0	10.52.44.250	UHSb	0	0	en0	-	-	=
>
10.52.44/24	10.52.44.250	U	1	37	en0	-	-
10.52.44.250	127.0.0.1	UGHS	0	11	lo0	-	-
10.52.44.255	10.52.44.250	UHSb	0	0	en0	-	-
127/8	127.0.0.1	U	6	200	lo0	-	-

Route	Tree	for	Protocol	Family	24	(Internet	v6):
::1	::1	UH	0	0	lo0	-	-
#

it looks like when I ping the ip I set 10.52.44.250 it is replying through the loop back interface and not en0 why? Is there something else I need to configure to communicate on the network?

Thanks for the Help

When you are trying to debug a single link like this, it is helpful to know that you must also configure your gateway so it knows how to "get back" to your AIX host.

If you can ping your own interface, but cannot ping an interface on a directly connected host, you need to look at the routing table of the directly connected device (in this case, your gateway).

Also, you should also look at the ARP tables on both devices just to make sure that both devices are properly working at the MAC layer.

I was able to connect a laptop using the same IP info I added to the AIX server so I am uncertain what changes need to be made to the ARP table or the routing table for the AIX server could you elaborate more on the topic and perhaps include the commands to view the routing and ARP tables?

Thanks

This rules out a possible misconfiguration of the other attached host (router/switch/whatever).

Use the "arp" command ("man arp") on the AIX server to list the content of the ARP cache. The content of the ARP cache is a table of Layer-2-Adresses (MAC-Adresses) of the interfaces present on the same network plus their respective IP adresses. If everything works correctly you should see 2 adresses there at least (your own interface and the interface of the connected station).

Btw.:

You should remove this static route. Use the "route" ("man route") command to do it for testing (it will not survive a reboot), use the "chginet" ("man chginet") to do it permanently.

I hope this helps.

bakunin