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Old 08-13-2013, 11:24 AM   #1
cunningrat
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Registered: Aug 2013
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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.
 
Old 08-13-2013, 11:54 AM   #2
Ser Olmy
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Registered: Jan 2012
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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?

Last edited by Ser Olmy; 08-13-2013 at 11:56 AM.
 
Old 08-13-2013, 12:27 PM   #3
cunningrat
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Registered: Aug 2013
Posts: 4

Original Poster
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Quote:
Originally Posted by Ser Olmy View Post
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 View Post
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
 
Old 08-13-2013, 12:42 PM   #4
cunningrat
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Registered: Aug 2013
Posts: 4

Original Poster
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Nevermind, the issue has been resolved. Stupid-a**e VIOS server lost the IP on the Shared Ethernet Adapter.
 
  


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