Date: Wed, 24 Feb 1999 06:20:10 +1300 From: Andrew McNaughton <andrew@squiz.co.nz> To: Andreas Braukmann <braukmann@tse-online.de> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: Wanted: descr. packet dataflow interfaces / forwarding / ipfw / nat Message-ID: <199902231720.GAA22179@aniwa.sky> In-Reply-To: Your message of "Tue, 23 Feb 1999 14:48:12 BST." <19990223144812.D7691@paert.tse-online.de>
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Packets coming out of NAT are just ordinary packets which get passed to the TCP stack again. Packets coming in on some interface will go to ipfw which may or may not block, log (hint) or send the packet to NAT. packets coming from NAT will then pass back into the tcp stack, and therefore ipfw. I presume they are first outgoing and then incoming on lo0, and then outgoing on whichever interface you route the packet to. Andrew McNaughton > Hi there, > > I'm searching for a piece of documentation or a 'simple' illustration > describing the flow of packets through the network stack. > > Currently I'm building a 'gateway-machine' that should get some > rather complicated (considering my knowledge of the networking code) > jobs done. (NAT on multiple interfaces, transparent proxying, etc.) > > My former natd/ipfw-setups were quite simple. But now I'm in need > of more detailed information concerning: > - at which stages/times the filter engine sees each packet > - whether a packet already translated by the natd, carries all > the 'additional' information (e.x. direction, incoming interface, etc) > further on > - etc. etc. > > Yes, ... I've read the obviously available (man-page, READMEs, etc.) > documentation thoroughly. > > Thanks in advance, > Andreas > > -- > : TSE TeleService GmbH : Gsf: Arne Reuter : : > : Hovestrasse 14 : Andreas Braukmann : We do it with : > : D-48351 Everswinkel : HRB: 1430, AG WAF : FreeBSD/SMP : > :--------------------------------------------------------------------: > : PGP-Key: http://www.tse-online.de/~ab/public-key : > : Key fingerprint: 12 13 EF BC 22 DD F4 B6 3C 25 C9 06 DC D3 45 9B : > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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