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Date:      Mon, 29 Mar 1999 23:49:40 -0500 (EST)
From:      "James A. Mutter" <jmutter@netwalk.com>
To:        freebsd-questions@freebsd.org
Subject:   userland ppp and the keepalive filter.
Message-ID:  <Pine.BSF.4.05.9903292342560.706-100000@insomnia.local.net>

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FreeBSD pokey.local.net 3.1-RELEASE FreeBSD 3.1-RELEASE #3: Sat Jan 19

The system is listed above.  As the subject line says, I'm having some
problems with the keepalive filter and ntp packets with userland ppp.

I'm trying to run xntpd on this machine, but the ntp packets are
keeping the connection alive for, quite literally, days at time.  This
is unacceptable.  :)

Following is my ppp.conf:

default:
 allow users corsmith jmutter
 set timeout 900
 set speed 115200
 set device /dev/cuaa0
 set dial "ABORT BUSY ABORT NO\\sCARRIER TIMEOUT 5 \"\" ATZ OK ATW1 OK
\\dATDT\\T TIMEOUT 40 CONNECT"
netwalk:
 set phone "1234567"
 set login "TIMEOUT 10 gin:-BREAK-gin: NotAChance word: NEVER"
 deny lqr
 set ifaddr 205.156.197.0/0 205.156.197.250/0 255.255.255.0 0.0.0.0
 delete ALL
 add 0 0 HISADDR
#
# Set filter to allow ntp packets through, but don't count them
towards keep
# alive
#

# This doesn't work - seems to deny _everything_ from the keepalive 
# filter.
#set filter alive 0 deny tcp src eq 123 dst eq 123
#set filter alive 1 deny udp src eq 123 dst eq 123

# set filter alive 0 deny udp src eq 123
# set filter alive 1 deny tcp src eq 123
# set filter alive 2 deny udp dst eq 123
# set filter alive 3 deny tcp dst eq 123

 set log local phase

As you can see, everything regarding the filter is commented out now.
When it was uncommented, that configuration seemed to deny
_everything_ from the keepalive filter.  The system would disconnect
after the 'timeout' period of 900 seconds.  

I tried using the examples posted in the handbook/ppp section, however
ppp didn't like those, the above entries are from the
/etc/ppp/ppp.conf.sample file.

Am I doing something wrong, maybe misunderstanding what those filters
do?  

As usual any help is appreciated.

Thank you,
Jim



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