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sorry for two posts instead of one, another alternative is to block traffic with a source of &quot;0.0.0.0&quot; (which is what DHCP requests are supposed to use as their source IP) from going across your VPN tunnel.
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sorry for two posts instead of one, another alternative is to block traffic with a source of "0.0.0.0" (which is what DHCP requests are supposed to use as their source IP) from going across your VPN tunnel.

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I thought VPN required to be different subnets? otherwise you could end up with confilicts..
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I thought VPN required to be different subnets? otherwise you could end up with confilicts..

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sure, so routing VPN is needed at here.
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Hello<br />
<br />
I have 2 networks connected to each other with bridged VPN. Both endpoints are acting as firewall/DHCP/VPN gateway. Problem is that when someone in one end makes DHCP request, wrong endpoint may answer it.. For example, if workstation in network #1 asks DHCP REQUEST, DHCP server in network #2 answers it. That way workstation in #1 gets the gateway and DNS's from network #2 and it is using #2 firewall/DHCP/VPN gateway as default GW.<br />
<br />
I have tried to patch kernels with ebtables so that I could filter out DHCP requests coming from other network, but recognizing those (because of bridge) is difficult. I would be happy to hear if someone has some good ideas for this..<br />
<br />
Cheers, Mikael
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Hello

I have 2 networks connected to each other with bridged VPN. Both endpoints are acting as firewall/DHCP/VPN gateway. Problem is that when someone in one end makes DHCP request, wrong endpoint may answer it.. For example, if workstation in network #1 asks DHCP REQUEST, DHCP server in network #2 answers it. That way workstation in #1 gets the gateway and DNS's from network #2 and it is using #2 firewall/DHCP/VPN gateway as default GW.

I have tried to patch kernels with ebtables so that I could filter out DHCP requests coming from other network, but recognizing those (because of bridge) is difficult. I would be happy to hear if someone has some good ideas for this..

Cheers, Mikael

DHCP and Bridged network

The term broadband commonly refers to high-speed Internet access that is always on and faster than the traditional dial-up access. Broadband includes several high-speed transmission technologies such as digital subscriber line (DSL), cable, fiber optics, wireless (for which there is a separate topic), satellite and broadband over powerlines (BPL).