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Enthusiast

Layer 2 network over VPN

Is it possible to extend the subnet (same broadcast domain) across a VPN tunnel? .For example we have 10.1.100.X in VLAN 100 at HQ can we use the same VLAN and same IP range at a remote site on the other side of the VPN tunnel, if so can they forward broadcast traffic?

Siddhartha       

Siddhartha
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Cisco Employee

Layer 2 network over VPN

You need to look into L2 tunneling (L2TP being possibly the choice, includes L2tp ovet ipsec).

Both SSL and IPsec are L3 solutions, you can share same subnet as a LAN interface but you might have problem with broadcasts depending on your configuration and actual needs.

3 REPLIES 3
Cisco Employee

Layer 2 network over VPN

You need to look into L2 tunneling (L2TP being possibly the choice, includes L2tp ovet ipsec).

Both SSL and IPsec are L3 solutions, you can share same subnet as a LAN interface but you might have problem with broadcasts depending on your configuration and actual needs.

Enthusiast

Layer 2 network over VPN

Thanks Marcin. I trying to decide between L2TPV3 and DLSW+ but posted it in WAN section. Thank you.

Siddhartha

Siddhartha
Participant

Layer 2 network over VPN

Dlsw+ is designed for legacy IBM kit. Dlsw will be processed switched and should avoided for something more general purpose. Matthew