misc/62207: ppp crashes with option 'nat punch_fw' when nat'ed host tries to do a directory listing

[Konstantin 'Kosta' Welke]

>Number:         62207
>Category:       misc
>Synopsis:       ppp crashes with option 'nat punch_fw' when nat'ed host tries to do a directory listing
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Jan 31 19:40:10 PST 2004
>Closed-Date:
>Last-Modified:
>Originator:     Konstantin 'Kosta' Welke
>Release:        5.2
>Organization:
>Environment:
FreeBSD no-lights.no-ip.org 5.2-RELEASE FreeBSD 5.2-RELEASE #1: Sat Jan 17 15:23:05 CET 2004     kosta at no-lights.no-ip.org:/usr/obj/usr/src/sys/no-home  i386
>Description:
`ppp -nat -ddial ispname` is running
`nat punch_fw 15 25` enabled in ppp.conf
when a nat'ed host tries to do any directory listing on an ftp server,
it crashes without leaving a note in ppp.log or messsges.

man ppp says ppp should take one number 'base count', but if you only
give it one number it says:
`Warning: usage: nat punch_fw [base count]`

Two numbers work fine, except for the crash ;-)
>How-To-Repeat:
just ftp list any directory on a nat'ed host
>Fix:
disabling the `nat punch_fw` option solves the problem
>Release-Note:
>Audit-Trail:
>Unformatted: