[ILUG] Routing ppp and a null modem cable

[Bryan O'Donoghue]

Paul Jakma wrote:
> On Mon, 16 Aug 2004, Bryan O'Donoghue wrote:
> 
>> Box 1 and 2 can ping each other respectively.
>>
>> Box 1 has an interface called eth0 with 10.100.100.22 as it's ip.
>>
>> I still have to do a route add -net default gw 192.168.3.1 to Box 2 
>> and even after I do that, I can't ping any 10.100.100.x ips.
> 
> 
> You should be able to ping  10.100.100.22 though, right?


Nope.

box 1: lo:1 192.168.3.1, eth0 10.100.100.22
     pppd -detach crtscts lock roxyarp 192.168.3.1:192.168.3.2 /dev/ttyS0 9600
     more /proc/sys/net/ipv4/ip_forward == 1

box 2: lo:1 192.168.3.2
  pppd -detach crtscts lock defaultroute 192.168.3.2:192.168.3.1 /dev/ttyS0 9600
  route add -net default gw 192.168.3.1

Pinging between the 192.168.3.x network works between the null modem cable
And box 2 definately can't ping 10.100.100.22

Could this have something to do with the fact that on both machines I'm using a 
second ip assigned to the loopback interface? Ordinarily, when ppp happens in 
the real world the IPs would be assigned to interfaces called ppp(blah), I 
can't see why it would make a difference, but, maybe pppd wants to route 
interfaces named ppp(blah) only?

-- 
Bryan O'Donoghue
Embedded Software Engineer

Europlex Technologies Ltd
Clonshaugh Business & Technology Park
Dublin 17
Ireland

T:+353 (0) 1 2500500
F:+353 (0) 1 2500590
E:bryano at europlex.ie
W:www.europlex.ie


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