[PROBLEM] no TUN device

[supahfly]

I tried this:

$ sudo mkdir /dev/net
$ sudo mknod /dev/net/tun c 10 200


but dont really know what happened when I started openvpn, casue I lost connectiopn.
When connection came back, the /dev/net directory was gone again ...

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strange my IPtables config ius gone as well ...
iptables -L
libkmod: ERROR ../libkmod/libkmod.c:554 kmod_search_moddep: could not open moddep file '/lib/modules/3.18.8+/modules.dep.bin'
iptables v1.4.14: can't initialize iptables table `filter': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
What the hell happened when I upgraded?

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apparently a problem with kmod version 20. How do I fix this?