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I need to merge two L2 broadcast domain into single domain and I have to do this over unmanaged by me L3 IP network.

All that I could find is vtun utility for linux.

Which software&howto you can suggest?

Thank you in advance.

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Create a VPN between the two networks. Use brctl to bridge the vpn and ethernet interfaces on each side.

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Found brctl in bridge-utils, will try tomorrow. – Dmitry Jan 12 '12 at 15:46

What type of connections are you trying to merge? Is this for two directly attached networks (say a multihomed Linux box) or is this two remote networks?

You might check out L2TP (Layer 2 tunneling protocol) which is commonly used with IPSec VPNs


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