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List: ipfilter
Subject: RE: ipnat wierdness at 16384 bytes
From: Fernando Germano <fgermano () metaimagen ! com ! ar>
Date: 1999-09-24 13:30:50
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I did this from my IPF box:
tcpdump -t 'port ftp or ftp-data'
And the FTP clients started to work!, this is VERY strange, with tcpdump
started I can FTP to the outside with no problems, but only with tcpdump
running (?)
Any ideas?
Thanks
Fernando Germano
Metaimagen WebMaster
e-mail: fgermano@metaimagen.com.ar
-----Original Message-----
From: Michael Richardson [mailto:mcr@sandelman.ottawa.on.ca]
Sent: Jueves 23 de Septiembre de 1999 18:27
To: Fernando Germano
Cc: ipfilter@coombs.anu.edu.au
Subject: Re: ipnat wierdness at 16384 bytes
Can you do a tcpdump on the outside of your IPF box?
I've noticed that some systems send very strange window
advertisements...
or perhaps you have a Path MTU blackhole.
] Train travel features AC outlets with no take-off restrictions|
firewalls [
] Michael Richardson, Sandelman Software Works, Ottawa, ON |net
architect[
] mcr@sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ |device
driver[
] panic("Just another NetBSD/notebook using, kernel hacking, security
guy"); [
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<P><FONT SIZE=2>I did this from my IPF box:</FONT>
</P>
<P><FONT SIZE=2> tcpdump -t 'port ftp or ftp-data'</FONT>
</P>
<P><FONT SIZE=2>And the FTP clients started to work!, this is VERY strange, with \
tcpdump started I can FTP to the outside with no problems, but only with tcpdump \
running (?)</FONT></P>
<P><FONT SIZE=2>Any ideas?</FONT>
</P>
<P><FONT SIZE=2>Thanks</FONT>
<BR><FONT SIZE=2>Fernando Germano </FONT>
<BR><FONT SIZE=2>Metaimagen WebMaster </FONT>
<BR><FONT SIZE=2>e-mail: fgermano@metaimagen.com.ar </FONT>
</P>
<BR>
<BR>
<P><FONT SIZE=2>-----Original Message-----</FONT>
<BR><FONT SIZE=2>From: Michael Richardson [<A \
HREF="mailto:mcr@sandelman.ottawa.on.ca" \
TARGET="_blank">mailto:mcr@sandelman.ottawa.on.ca</A>]</FONT> <BR><FONT SIZE=2>Sent: \
Jueves 23 de Septiembre de 1999 18:27</FONT> <BR><FONT SIZE=2>To: Fernando \
Germano</FONT> <BR><FONT SIZE=2>Cc: ipfilter@coombs.anu.edu.au</FONT>
<BR><FONT SIZE=2>Subject: Re: ipnat wierdness at 16384 bytes </FONT>
</P>
<BR>
<BR>
<P><FONT SIZE=2> Can you do a tcpdump on the outside of your IPF box? </FONT>
<BR><FONT SIZE=2> I've noticed that some systems send very strange window \
advertisements...</FONT> <BR><FONT SIZE=2>or perhaps you have a Path MTU \
blackhole.</FONT> </P>
<P><FONT SIZE=2>] Train travel features AC outlets with no take-off \
restrictions| firewalls [</FONT> <BR><FONT SIZE=2>] Michael \
Richardson, Sandelman Software Works, Ottawa, ON |net \
architect[</FONT> <BR><FONT SIZE=2>] mcr@sandelman.ottawa.on.ca <A \
HREF="http://www.sandelman.ottawa.on.ca/" \
TARGET="_blank">http://www.sandelman.ottawa.on.ca/</A> |device driver[</FONT> \
<BR><FONT SIZE=2>] panic("Just another NetBSD/notebook using, kernel hacking, \
security guy"); [</FONT> </P>
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