hubertf's NetBSD Blog
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[20100215] Setting up a PPPoE server with NetBSD
I had an urge to configure PPPoE today, but didn't have a DSL line handy to test it. So, with some help from martin@, I got to prod NetBSD into becoming a PPPoE server.

I've put my notes here.

Open issues:

  • Whenever I terminate a client session ("ifconfig pppoe0 down"), the server's pppoe0 interface goes down as well. Before new connections are served, I have to do a manual "ifconfig pppoe0 up".
  • When I add "query-dns=3" to the client side, the connection is terminated immediately after it's established. I don't know how to offer DNS servers via PPPoE/LCP, but at least just leaving the connection open instead of terminating it would be nice.
I understand this method is only for one/few PPPoE connections. If more sessions are needed, this may not be the best option. It still served my purpose well. YMMV.

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[20080826] PPPoE Security Advisory
NetBSD's NetBSD-SA2008-010 security advisory describes a vulnerability where a malicious PPPoE discovery packet can overrun a kernel buffer: ``A bug in range checking allows a malicious packet to make the kernel access memory outside of the allocated buffer and cause a kernel crash. It is currently unclear if this issue could be exploited any further than denial of service.''

See the Security Advisory for more technical details as well as how to fix your kernel.

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[20041111] xBSD PPPoE performance comparison
Admittedly it's a bit dated being from 2002, but I still think this comparison of various Linux and BSD's PPPoE implenentations is quite interesting. Needless to say because NetBSD takes the best bet there. ;)

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Disclaimer: All opinion expressed here is purely my own. No responsibility is taken for anything.

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Copyright (c) Hubert Feyrer