ERROR: could not insert 'iptable_nat': Exec format error

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Yoppie

New Member
Mar 17, 2014
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I just got a new dedicated server with proxmox installed.
Code: 
# pveversion
pve-manager/3.4-3/2fc72fee (running kernel: 2.6.32-37-pve)
But it seems the nat module is not loaded:
Code: 
# iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -o vmbr1 -j MASQUERADE
iptables v1.4.14: can't initialize iptables table `nat': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
I tried to load it but I'm getting the following errors:
Code: 
# modprobe iptable_nat
ERROR: could not insert 'iptable_nat': Exec format error
Code: 
# insmod /lib/modules/2.6.32-37-pve/kernel/net/ipv4/netfilter/iptable_nat.ko
Error: could not insert module /lib/modules/2.6.32-37-pve/kernel/net/ipv4/netfilter/iptable_nat.ko: Invalid module format

Do you have any idea what's wrong and how I can fix it?
 
Yoppie said:
I just got a new dedicated server with proxmox installed.
Code: 
# pveversion
pve-manager/3.4-3/2fc72fee (running kernel: 2.6.32-37-pve)

Code: 
# insmod /lib/modules/2.6.32-37-pve/kernel/net/ipv4/netfilter/iptable_nat.ko
Error: could not insert module /lib/modules/2.6.32-37-pve/kernel/net/ipv4/netfilter/iptable_nat.ko: Invalid module format

Do you have any idea what's wrong and how I can fix it?
Click to expand...

Did you make recently a kernel upgrade without reboot afterwards? If so reboot the system!

Check also the file data by

Code: 
ls -l /lib/modules/2.6.32-37-pve/kernel/net/ipv4/netfilter/iptable_nat.ko

should result

Code: 
-rw-r--r-- 1 root root 15888 Mar 18 08:29 /lib/modules/2.6.32-37-pve/kernel/net/ipv4/netfilter/iptable_nat.ko

A system upgrade is useful in any case.
 
Code: 
# ls -l /lib/modules/2.6.32-37-pve/kernel/net/ipv4/netfilter/iptable_nat.ko
-rw-r--r-- 1 root root 15888 Mar 18 08:29 /lib/modules/2.6.32-37-pve/kernel/net/ipv4/netfilter/iptable_nat.ko

I will try rebooting.
 
Rebooting worked. Thanks for pointing me in the right direction.

It's surprising because I hadn't touched the server since it was delivered by my hosting provider but anyway. It works now.
 
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