***** Question about routing with PPP *****

***** Question about routing with PPP *****

Post by Joop Stakenbo » Tue, 16 Jan 1996 04:00:00

Hi, thanks for reading.

I am trying to setup a PPP link between 2 linux boxes. The connection works
fine, but something seems to be wrong with the routing.

The remote side has address xx.xxx.xx.xxx.

The server has address yyy.yy.yyy.yyy. They are not in the same domain.
The server has proxyarp enabled with pppd.
I compiled the server's kernel with IP forwarding and gatewaying. Version
1.3.50 with ppp 2.2.0.c.
I even tried a 'arp -s xx.xxx.xx.xxx 00:00:E8:07:E3:E0 pub'.

I can ping from xx.xxx.xx.xxx to yyy.yy.yyy.yyy, but not onto the
What am I doing wrong here?
The server says, after the ppp connect:

Any ideas?

joop stakenborg


1. Questions about routing with PPP and subnetting

I have half a class C to play with, and I need to use ONE host on this
network as a dialin PPP gateway with as much as 8 analog modems.

The 1/2 class C, as well as the remotes will have to access the

Do the remote_via_PPP hosts HAVE to be on a different subnet (carved
from the 1/2 class C address I have)?

* * * hypothesis #1

Right now, I have this:

Network address: aaa.bbb.ccc.128

Should I subnet the whole shebang like this:

Network address: aaa.bbb.ccc.128

Network address: aaa.bbb.ccc.192

meaning that I should put all my hosts on the first half of my address
block (from 129 to 190, excluding the net and broadcast addresses) with
a netmask of aaa.bbb.ccc.192 ?

* * * hypothesis #2

But I don't want to waste so many addresses, so a best way would be to
instead use a smaller subnet as a remote network, say like:

Network address: aaa.bbb.ccc.240

and make three other subnets at aaa.bbb.ccc.192, 208 and 224?

* * * In any cases,

in the pppd connect command parameters to initiate the PPP connection,
should I avoid specify any IP addresses for the PPP links?

If not, which address should I use? Do they have to fit within my
current C address block (if they do, do they have to have their own
subnet mask?), or they can be picked out of thin air (meaning they could
very well impinge on currently used addresses somewhere else in the

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