PPP and Route Delete

[Melissa Jenkins]

On 11 Jan 2011, at 09:13, Luiz Otavio O Souza wrote:

> On Jan 10, 2011, at 2:25 PM, Melissa Jenkins wrote:
>> 
>> I've been working on migrating a PPTP server from FreeBSD 7.1 to FreeBSD 8.1.  The server is configured using PopTop (from ports) and PPP (/usr/sbin) rather than MPD.  (Before anybody tells me to use MPD we can't because it doesn't inject packets into the kernel in the same way and it's not possible to filter on them correctly)
>> 
>> Basic PPTP connection works properly.  
>> 
>> The fun happens when I have two simultaneous users.  The first one to DISCONNECT deletes the routes for both of them and all PPTP traffic ceases.
>> 
>> I believe this is because of the third RTM_DELETE message in the route monitor output below (From FreeBSD 8.1):
> 
> 
> I believe it's the second call... but probably doesn't matter...

Yes - I must have switched programming languages and ended up starting at 1 :(

> 
> How are you setting the IP address for vpn connections (radius?) ?
> 

I've got them configured in the third column in the secret file:

eg:
... 
melissa dummypw 10.0.0.31
john dummypw 10.0.0.32


> I'm also using poptop with ppp without any problem, here is my ppp.conf (look at differences on 'set ifaddr'):
> 
> default:
> set log Phase Chat LCP IPCP CCP tun command Warning Error
> ident user-ppp VERSION (built COMPILATIONDATE)
> 
> pptp:
> set ifaddr 10.10.0.1 10.10.3.100-10.10.3.104 255.255.255.255
> [snip]
> Some details:
> 
> 10.10.0.1 is the internal IP on the pptp server;
> 10.10.3.100-10.10.3.104 is my range of IPs used for vpn purposes (i'm using 10.10.0.0/22 as internal network).

I've just tried it configured as

set ifaddr 10.0.5.1 HISADDR 255.255.255.255

It still sends the route delete:
got message of size 192 on Mon Jan 10 23:35:03 2011
RTM_DELETE: Delete Route: len 192, pid: 0, seq 0, errno 0, flags:<UP,GATEWAY,STATIC>
locks:  inits:
sockaddrs: <DST,GATEWAY,NETMASK>
 default 10.0.5.1 default

with

set ifaddr 10.0.5.1 10.0.0.1-10.0.0.255 255.255.255.255

got message of size 192 on Mon Jan 10 23:37:02 2011
RTM_DELETE: Delete Route: len 192, pid: 0, seq 0, errno 0, flags:<UP,GATEWAY,STATIC>
locks:  inits:
sockaddrs: <DST,GATEWAY,NETMASK>
 default 10.0.5.1 default

:(

Going to spend some time looking at the PPP code and see if I can figure out what triggers it.

Mel