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cunningrat 08-13-2013 11:24 AM
Network issue: Fedora19, IBM LPAR
 
Disclaimer: I'm a UNIX admin but I haven't played with Linux in forever. Trying to get back into it.

I've installed Fedora 19 on an IBM P520, in an LPAR under VIOS. I'm trying to configure networking, and I'm running into issues.

First of all, since I have neither the network nor an attached terminal, I cannot use GUI tools. So I've disabled NetworkManager, and tried to do a very simple, static IP configuration using ip and route, and (when that failed) editing the scripts in /etc/sysconfig/network-scripts. Nothing I do seems to work: I cannot ping out.

I've double-checked the VIOS Shared Ethernet Adapter settings: they're all set correctly.

Kernel module ibmveth is loaded.
VLANs are not used in the environment.

Here's the relevant troubleshooting information.

Code:
[root@tophat ~]# cat /etc/sysconfig/network
# Created by anaconda
NETWORKING=yes
HOSTNAME=tophat.ELIDED.com
GATEWAY=172.16.10.237
Code:
[root@tophat ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
NETMASK=255.255.0.0
IPADDR=172.16.10.172
USERCTL=no
[
Code:
root@tophat ~]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.16.10.172 netmask 255.255.0.0 broadcast 172.16.255.255
ether c6:1c:ff:cc:4a:02 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 18 bytes 2321 (2.2 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 19

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
loop txqueuelen 0 (Local Loopback)
RX packets 103 bytes 8600 (8.3 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 103 bytes 8600 (8.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
Code:
[root@tophat ~]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 172.16.10.237 0.0.0.0 UG 0 0 0 eth0
link-local * 255.255.0.0 U 1002 0 0 eth0
172.16.0.0 * 255.255.0.0 U 0 0 0 eth0
Can anyone spot any errors, suggest further troubleshooting steps, etc? Please? I'm kind of at the end of my rope here.

Ser Olmy 08-13-2013 11:54 AM
The configuration looks good to me.

Can you ping the gateway or other hosts on the local network? (How big is that network anyway, since you're using a /16 mask?) If not, what does arp -an report immediately afterwards?

How far does traceroute -n 8.8.8.8 get?

cunningrat 08-13-2013 12:27 PM
Quote:
Originally Posted by Ser Olmy (Post 5008660)
The configuration looks good to me.

Can you ping the gateway or other hosts on the local network?
No, I cannot ping the gateway or any other hosts.

Quote:
Originally Posted by Ser Olmy (Post 5008660)
If not, what does arp -an report immediately afterwards?

How far does traceroute -n 8.8.8.8 get?
Code:
                                                                     
[root@tophat ~]# arp -an                                                           
? (172.16.10.237) at <incomplete> on eth0                                           
[root@tophat ~]# traceroute -n 8.8.8.8                                             
traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets                       
 1  172.16.10.172  2996.723 ms !H  2996.556 ms !H  2996.452 ms !H

cunningrat 08-13-2013 12:42 PM
Nevermind, the issue has been resolved. Stupid-a**e VIOS server lost the IP on the Shared Ethernet Adapter.


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