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/usr/share/doc/ppp/examples/per-linkname is in ppp 2.4.5-5ubuntu1.

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Date: Mon, 06 Oct 2003 16:00:25 +0200
From: Eyal Rozenberg <rozenbrg@barak-online.net>
Subject: ppp per-linkname script dir

(I'm writing you as the maintainer of the Debian ppp package)

On my system, I sometime find it necessary to run different commands for 
different peers/providers after the ppp connection, like specific 
complex routing configuration, etc. To do so I have added the files 
/etc/ppp/ip-up.d/00peer-specific and /etc/ppp/ip-down.d/00peer-specific
whose contents is:
------------------------------------------------------------------

#!/bin/bash
#
# run peer-specific (or, rather, 'link-name' specific) scripts

if [ -n "$LINKNAME" ] ; then
         run-parts /etc/ppp/ip-up.d/$LINKNAME
fi

exit 0

------------------------------------------------------------------

and the same thing for if-down.d (but with its respective directory 
name). To use these, one must set the linkname pppd option in the files 
under /etc/ppp/peers - but that's a good idea anyway.

Perhaps you would consider adding such files to the ppp package.

Eyal Rozenberg