Date: Thu, 4 Apr 2013 11:24:18 +0000 From: "Eggert, Lars" <lars@netapp.com> To: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: enable tcpdump GUESS_TSO flag? Message-ID: <0A5ED929-C148-45C3-8576-C31D2C05AB04@netapp.com>
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Hi, I wonder whether it'd be a good idea to enable tcpdump's GUESS_TSO flag by = default? It enables a heuristic that lets tcpdump understand pcaps that inc= lude segments generated by TCP TSO (which otherwise show up as "IP bad-len = 0".) See the dicussion at http://www.mail-archive.com/tcpdump-workers@lists.tcpd= ump.org/msg01051.html for details. Lars diff --git a/usr.sbin/tcpdump/tcpdump/Makefile b/usr.sbin/tcpdump/tcpdump/M= akefile index ca8ec4c..5fd73a1 100644 --- a/usr.sbin/tcpdump/tcpdump/Makefile +++ b/usr.sbin/tcpdump/tcpdump/Makefile @@ -45,6 +45,10 @@ CFLAGS+=3D -I${.CURDIR} -I${TCPDUMP_DISTDIR} CFLAGS+=3D -DHAVE_CONFIG_H CFLAGS+=3D -D_U_=3D"__attribute__((unused))" =20 +# Enable tcpdump heuristic to identify TSO-generated packets; see +# http://www.mail-archive.com/tcpdump-workers@lists.tcpdump.org/msg01051.h= tml +CFLAGS+=3D -DGUESS_TSO + .if ${MK_INET6_SUPPORT} !=3D "no" SRCS+=3D print-ip6.c print-ip6opts.c print-mobility.c print-ripng.c \ print-icmp6.c print-babel.c print-frag6.c print-rt6.c print-ospf6.c \
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