Date: Tue, 20 Apr 1999 17:10:07 +1000 From: Stanley.Hopcroft@ipaustralia.gov.au To: freebsd-questions@freebsd.org Cc: Carl.Makin@ipaustralia.gov.au Subject: IPFW and bridging Message-ID: <4A256759.00277723.00@noteshub01.aipo.gov.au>
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Dear Ladies and Gentlemen, I am writing to ask your help with the new BRIDGE kernel option, to use ipfw to discard packets that will cause *chaos* if they are forwarded (eg DHCP clients on 2 LANs each with their own DHCP server connected by a transparent bridge ... clients are offered addresses by both servers, which may not be what you want ...) Please would you tell me 1 is it possible to bridge based on LLC SAP (eg 0xAA for 802.3 encapsulated IP packets, 0x04 for SNA etc) ? 2 is it possible to bridge based on any other part of the packets contents. man ipfw refers to /etc/protocols but my 2,2.8-STABLE router has no such file ? 3 How can I do these things ? My kernel, 2.2.8-STABLE, has option BRIDGE set, the sysctl options for bridge are visible, the box has two ed interfaces. The box certainly bridges - as the DHCP catastophe informed me - but I need to restrain it. Thank you, Yours sincerely. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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