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Date: Wed, 6 Aug 1997 18:29:01 -0700
From: Frank MacLachlan <fpm@n2.net>
To: Greg Lehey <grog@lemis.com>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: Question: ppp -auto
References: <199708062232.QAA02111@phantom.srccomp.com> <199708062349.JAA01409@freebie.lemis.com>
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In-Reply-To: <199708062349.JAA01409@freebie.lemis.com>; from Greg Lehey on Thu, Aug 07, 1997 at 09:19:05AM +0930
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On Thu, Aug 07, 1997 at 09:19:05AM +0930, Greg Lehey wrote:
> [snip]
> 
> In order for ppp -auto to detect outgoing packets, it first has to
> receive them.  For this to happen, there must be a route which points
> to the ppp interface.  This means that you need to know at least the
> IP address which will be assigned to the interface (in other words,
> this won't work with a dynamically allocated address).  When you start
> the system, you need to issue at least the following commands:
> 
>   ifconfig tun0 my-ip-address his-ip-address
>   route add default his-ip-address
> 
> Normally, you'd do this in sysconfig:
> 
>   network_interfaces="....  tun0"	# include tun0 in the list of
>                                         # network interfaces
>   ifconfig_tun0="my-ip-address his-ip-address"  # see above
>   static_routes="route_tun0"	# add route_tun0 to anything else you
> 				# might have here
>   route_tun0="default his-ip-address"  # see above

I do autodial ppp w/o any modifications to /etc/sysconfig.  I fire off
ppp in /etc/rc.local and it dials out when I go outside of my local
network.  Here's my /etc/ppp.conf file:

------------------------------------
default:
 set device /dev/cuaa1
 set speed 115200
 disable lqr
 deny lqr
 disable vjcomp
 deny vjcomp
 set dial "ABORT BUSY ABORT NO\\sCARRIER TIMEOUT 5 \"\" ATE1Q0 OK-ATS27=32-OK \\dATDT\\T TIMEOUT 40 CONNECT"

# USR server w/ static IP addr on my end, dynamic IP addr on far end of link.
n2f_new:
 set phone 1234567
 set login "TIMEOUT 10 gin:-BREAK-gin: fixed-ip-login-name word: my-password"
 set timeout 900
 set ifaddr 207.111.222.333 207.111.222.1/0 255.255.255.0
 add 0 0 207.111.222.1

# USR server w/ dynamic IP addr on both ends of link.
n2d_new:
 set phone 1234567
 set login "TIMEOUT 10 gin:-BREAK-gin: dynamic-ip-login-name word: my-password"
 set timeout 900
 set ifaddr 207.111.222.333/0 207.111.222.1/0 255.255.255.0
 add 0 0 207.111.222.1
------------------------------------

The trick is to establish a route that goes to the ppp device.
I don't care if the IP addresses are correct, therefore I use
207.111.222.1/0 which indicates that 0 bits of the IP address
are assumed correct.  The 207.111.222 value is the address of
the ISP's class C network; the 1 at the end is arbitrary and the
correct value will be filled in the linkup phase.

Here's my ppp.linkup:

------------------------------------
MYADDR:
	delete ALL
	add 0 0 HISADDR
------------------------------------

-- 
Frank MacLachlan (fpm@n2.net)
N2 Networking, San Diego, CA