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тАО12-30-2008 09:49 PM
тАО12-30-2008 09:49 PM
I have just upgraded a production linux server from Redhat ES v4.5 to V4.7. Now I can no longer connect to the network, getting
[root@dcpbl03 default]# ping 172.29.240.1
PING 172.29.240.1 (172.29.240.1) 56(84) bytes of data.
From 172.29.242.195 icmp_seq=0 Destination Host Unreachable
From 172.29.242.195 icmp_seq=1 Destination Host Unreachable
From 172.29.242.195 icmp_seq=3 Destination Host Unreachable
From 172.29.242.195 icmp_seq=4 Destination Host Unreachable
--- 172.29.240.1 ping statistics ---
7 packets transmitted, 0 received, +4 errors, 100% packet loss, time 6014ms
, pipe 3
I haven't touched any config files, just ran up2date.
The server was perfectly OK before the upgrade. It can see the other member servers within it's local VLAN but cannot pass through the gateway to the rest of the world.
Any magic spells? Getting desperate..
Thanks in advance and I do give out 10 points for replies...
Graham
Solved! Go to Solution.
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тАО12-30-2008 10:54 PM
тАО12-30-2008 10:54 PM
Re: connection problems after Red Hat upgrade
> From 172.29.242.195 [...]
These appear to be on different subnets,
depending on the (unrevealed) subnet mask.
> [...] cannot pass through the gateway [...]
We non-psychics can't divine the netmask or
routing on your system, or the identity of
that gateway to which you refer. Perhaps a
few ifconfig and/or netstat (-r) commands
would reveal some useful information.
Clearly ("Destination Host Unreachable"),
there's no route to that destination.
> Any magic spells?
Find out what it's doing, then fix it?
> Getting desperate..
Get organized instead.
> [...] within it's local VLAN [...]
"its".
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тАО12-31-2008 02:23 AM
тАО12-31-2008 02:23 AM
Re: connection problems after Red Hat upgrade
Can you send us "ifconfig" and "netstat -rn" output?
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тАО12-31-2008 07:55 PM
тАО12-31-2008 07:55 PM
Re: connection problems after Red Hat upgrade
[root@dcpbl03 ~]# ifconfig
bond0 Link encap:Ethernet HWaddr 00:15:60:09:AA:90
inet addr:172.29.242.195 Bcast:172.29.242.223 Mask:255.255.255.224
inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1
RX packets:534 errors:0 dropped:0 overruns:0 frame:0
TX packets:10962 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:35244 (34.4 KiB) TX bytes:714291 (697.5 KiB)
bond1 Link encap:Ethernet HWaddr 00:15:60:0A:EC:7E
inet addr:192.168.240.113 Bcast:192.168.240.255 Mask:255.255.255.0
inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1
RX packets:19106 errors:0 dropped:0 overruns:0 frame:0
TX packets:308 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1296166 (1.2 MiB) TX bytes:19722 (19.2 KiB)
eth0 Link encap:Ethernet HWaddr 00:15:60:0A:EC:7E
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:10721 errors:0 dropped:0 overruns:0 frame:0
TX packets:308 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:759526 (741.7 KiB) TX bytes:19722 (19.2 KiB)
Interrupt:50
eth1 Link encap:Ethernet HWaddr 00:15:60:0A:EC:7E
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:8385 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:536640 (524.0 KiB) TX bytes:0 (0.0 b)
Interrupt:217
eth2 Link encap:Ethernet HWaddr 00:15:60:09:AA:90
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:284 errors:0 dropped:0 overruns:0 frame:0
TX packets:10962 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:18176 (17.7 KiB) TX bytes:714291 (697.5 KiB)
Interrupt:225
eth3 Link encap:Ethernet HWaddr 00:15:60:09:AA:90
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:250 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:17068 (16.6 KiB) TX bytes:0 (0.0 b)
Interrupt:233
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:20222 errors:0 dropped:0 overruns:0 frame:0
TX packets:20222 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:11629098 (11.0 MiB) TX bytes:11629098 (11.0 MiB)
[root@dcp
The gateway IP is virtual IP address within the VLAN.
root@dcpbl03 ~]# netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
172.29.242.192 0.0.0.0 255.255.255.224 U 0 0 0 bond0
192.168.240.0 0.0.0.0 255.255.255.0 U 0 0 0 bond1
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 bond1
0.0.0.0 172.29.242.222 0.0.0.0 UG 0 0 0 bond0
[root@dcpbl03 ~]#
Thanks for you input,
Graham
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тАО12-31-2008 10:55 PM
тАО12-31-2008 10:55 PM
Re: connection problems after Red Hat upgrade
anything named "bondX", ...
> bond0 Link encap:Ethernet HWaddr 00:15:60:09:AA:90
> inet addr:172.29.242.195 Bcast:172.29.242.223 Mask:255.255.255.224
A netmask of 255.255.255.224 takes all but
five bits for the network. This seems odd to
me, but not impossible.
If I read it correctly, this is the default
route:
0.0.0.0 172.29.242.222 0.0.0.0 UG 0 0 0 bond0
and the gateway, 172.29.242.222, is in the
same subnet as 172.29.242.195 (netmask
255.255.255.224), so, if I'm doing my
arithmetic correctly, you ought to be able to
get to the gateway, so I don't see a problem
there.
172.29.240.1 is on a different subnet, so you
would need a route and gateway, but you seem
to have them, so it all looks good to me.
Does the gateway system know how to get back
to this subnet? (Same commands on it?) I'd
expect a different complaint if the problem
were at that end, but either I'm missing
something (too), or else desperation is
starting to look more appropriate.
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тАО01-01-2009 01:08 AM
тАО01-01-2009 01:08 AM
Re: connection problems after Red Hat upgrade
2Graham - it is possible that RHEL upgrade changed NIC ordering in linux.
I suggest you to re-check that every NIC is connected to the right VLAN and included in the right bond devce.
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тАО01-01-2009 01:11 AM
тАО01-01-2009 01:11 AM
Re: connection problems after Red Hat upgrade
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тАО01-01-2009 05:22 PM
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тАО01-07-2009 07:21 PM
тАО01-07-2009 07:21 PM
Re: connection problems after Red Hat upgrade
Turns out to be a dead NIC in a bond. It seems that it will failover when online but will not restart after reboot.
Thanks for all your advice.
Graham
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тАО01-07-2009 07:23 PM
тАО01-07-2009 07:23 PM