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It's a little unclear what your setup is, but let me take a guess and make some suggestions :) 1) Assuming a setup something like the following LAN A --- (ETH) [LINUX A] (PPP) [LINUX B] (ETH) --- LAN B In the above, I would assume the goal is to join (bridge) LAN A and LAN B together? You could configure basic IP across the PPP link so that the two linux boxes can reach each other. You then configure something like vtun or etherip to run over the IP/PPP link between the two linux boxes. Finally you setup bridges at each end, the result would look something like: LAN A --- (ETH){BR on LINUX A}(TUN) --- (PPP) --- (TUN){BR on LINUX B}(ETH) --- LAN B The etherip has the caveat that it doesn't support fragmentation so will only work if the PPP link supports a large MTU, say 1540 or greater. 2) A less likely scenario is PPP Client --- (ETH)[LINUX](ETH) --- PPP Server In the above you want to get your PPP session going through a linux box in the middle. If the PPP is PPPoE, adding the ETH's to a bridge on the linux box should be sufficient. If it's some other variant of PPP you might be able to use L2TP to tunnel the PPP between end points. I've seen this done in a DSL/BRAS environment where the BRAS wasn't directly attached to the DSLAMs. I suspect this is far from straight forward. Dylan On Thu, 2008-06-19 at 23:49 +0800, c.j wrote: >We use vtun which is a userland option, a little slow but offers rate-limiting and some other nice to have features. Thanks for your kind suggestion. Whether the etherip patches can transmit ppp packet? Since I'm not familiar with them , I need some time to read them if so. Regards~ -- c.j |
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