On Thu, Oct 11, 2012 at 12:09:55PM -0700, Brian Morris wrote: > It seems the helper match shouldn't succeed if the strings being > compared aren't the same length. > > For example, both of these nat rules match the helper connections > if I start an FTP session on master port 212 with FTP conntrack > configured to support both ports: > > -A PREROUTING -p tcp -m state --state RELATED -m helper --helper > "ftp-212" > -A PREROUTING -p tcp -m state --state RELATED -m helper --helper > "ftp-2122" > > because the strncmp is just using the length of the helper. Is > this by design? The nat table only sees -m state --state (or preferred, -m conntrack --ctstate) NEW packets. You have restricted your rule to match packets which will never reach that table/chain. -- http://rob0.nodns4.us/ -- system administration and consulting Offlist GMX mail is seen only if "/dev/rob0" is in the Subject: -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
