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
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