Date: Thu, 16 Jul 2009 12:22:32 -0700 From: Chuck Swiger <cswiger@mac.com> To: Dmitriy Demidov <dima_bsd@inbox.lv> Cc: freebsd-ipfw@freebsd.org Subject: Re: ipfw nat and localy initiated UDP traffic (bad udp cksum) Message-ID: <2CE3CD12-D430-4378-92C1-591227888428@mac.com> In-Reply-To: <200907162219.04986.dima_bsd@inbox.lv> References: <200907142355.34973.dima_bsd@inbox.lv> <200907162219.04986.dima_bsd@inbox.lv>
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On Jul 16, 2009, at 12:19 PM, Dmitriy Demidov wrote: > Update about this issue. > There is somthing wrong with UDP pass through - ipfw nat makes it > "bad cksum". tcpdump receives local network traffic before the checksums are computed (especially if hardware checksums are enabled); this is a non- issue, although you could confirm by sniffing the traffic from an external machine like a laptop. Regards, -- -Chuck
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