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Date: Mon, 11 Nov 1996 17:26:36 -0500
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To: roberto@keltia.freenix.fr (Ollivier Robert)
From: dennis@etinc.com (dennis)
Subject: Re: Setting PPP netmask! HOW!
Cc: hackers@freebsd.org
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>According to dennis:
>> market. I believe that the netmask is meaningless on a PTP interface,
>> so even if you get it to display the way you want  you won't have
>> achieved much of anything.
>
>That's not true. 
>
>Consider my case. We -- a group of friends -- have a C-class address
>(/24). We have cut in in 16 subnets (/28) and distributed the subnets
>between us. We connect thru PPP to a machine in one of these subnets. My
>ethernet at home has another subnet. We have an interconnection subnet for
>the Internet router.
>
>It would be impossible to send packets to my ethernet and to the Internet
>thru the PPP at the same time if subnets were not handled correctly by
>"pppd" (kernel PPP).
>
>ed0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>	inet 193.56.58.65 netmask 0xfffffff0 broadcast 193.56.58.79
>	ether 00:00:c0:7c:66:48 
>
>pppd is run with this (line cut for display):
>
>$PROG $DEFOPTS connect 'chat -v ABORT "NO CARRIER" ABORT BUSY "" AT   \
>OK ATDTXXXXXXXX CONNECT "" ogin: XXXXXXX assword: \qXXXXXXXX' netmask \
>255.255.255.240 /dev/$DEVICE 115200 
>
>That way, I have a subnet route for my ethernet in /28...
>
>Routing tables
>
>Internet:
>Destination        Gateway            Flags     Refs     Use     Netif Expire
>127.0.0.1          127.0.0.1          UH          2      688       lo0
>193.56.58.64/28    link#1             UC          0        0 
>193.56.58.65       0:0:c0:7c:66:48    UHLW        0      958       lo0
>
>...and the default route will be added to another subnet when PPP is up.
>
>PPP correct handling of subnetting is *vital* for me.

Its not quite working the way you think (the PPP routes are "hosts" and
the subnet is irrelevant), but it you're happy........what the heck!

Dennis