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Date:      Mon, 28 Dec 1998 15:07:20 -0500
From:      Glen Mann <gmann@cyberia.com>
To:        FreeBSD-questions@FreeBSD.ORG
Subject:   PPP keepalive filters
Message-ID:  <3687E4F8.17882976@cyberia.com>

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Hello-

My ISP drops my connections after a ridiculously short inactivity. 
Apparently the afilters are the way to keep the connection alive,
however, the documentation does not say what the following do:

#
# KeepAlive filters
# Don't keep Alive with ICMP,DNS and RIP packet
#
 set afilter 0 deny icmp
 set afilter 1 deny udp src eq 53
 set afilter 2 deny udp dst eq 53
 set afilter 3 deny udp src eq 520
 set afilter 4 deny udp dst eq 520
 set afilter 5 permit 0/0 0/0

What actually happens, especially where performance is concerned?  Would
it be better to send a ping packet every few minutes?

Thanks
-Glen

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