Date: Tue, 18 Aug 1998 17:33:01 +0800 (SGT) From: Roland Yeo <roland@cir.nus.edu.sg> To: Kevin Kyeong-il CHOI <kevin.choi@cnes.fr> Cc: FreeBSD Question <freebsd-questions@FreeBSD.ORG>, FreeBSD Net <freebsd-net@FreeBSD.ORG> Subject: Re: Questions on TCPDUMP, TCP Window Size Message-ID: <Pine.BSF.4.02.9808181718010.8911-100000@huiching.singaren.net.sg> In-Reply-To: <000501bdca86$55eac6c0$52099584@pc-kichoi.cst.cnes.fr>
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On Tue, 18 Aug 1998, Kevin Kyeong-il CHOI wrote: > (1) First question. > I want to make the RFC1323 works on FreeBSD 2.2.6. > Is there any special procedure I need to do ? > by default this is enabled I think. /etc/rc.conf: tcp_extensions="YES" # Allow RFC1323 & RFC1644 extensions (or NO). /etc/rc.network: if [ -n "$tcp_extensions" -a "x$tcp_extensions" != "xYES" ] ; then echo -n ' tcp extensions=NO' sysctl -w net.inet.tcp.rfc1323=0 >/dev/null 2>&1 sysctl -w net.inet.tcp.rfc1644=0 >/dev/null 2>&1 fi > (2) Second. > Once the (1) question resolved, > How can I make TCP's option "Window Scale" work on > any connection such as FTP ? > you might require to set the socket buffer sizes in the sources: http://www.ncsa.uiuc.edu/People/vwelch/net_perf/tcp_windows.html#how > (3) Third > TCPDUMP, as a real good utility to observe the traffic > on TCP connection, I really want to use this. BUT, But, > whenever I launch this "tcpdump [enter]", it tells me, > > tcpdump: /dev/bpf0: Device not configured. > > I tried to change chmod 666 /dev/bpf0, but no succeed. > > What is the problem here ? > perhaps you did not configure your kernel to support the packet filter. check that your kernel config file has the following: pseudo-device bpfilter 4 regards, roland -- Roland Yeo <roland@cir.nus.edu.sg> SingAREN, Centre for Internet Research, National University of Singapore To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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