I am having some issues getting ospf to propagate over pptp.
I can establish the pptp connection without problem, and I very much understand that you need a static route with a lower distance to allow the pptp tunnel to stay open. Simply put it would try to send the pptp encapsulation packets over the ospf route which is in the pptp link if you did not do this.
Everything works fine until I enable ospf on each router. When I enable OSPF everything dies for about 10 seconds, then comes back on for a few seconds, then dies again, then repeats over and over. My guess is that the pptp link is being established, then ospf is propagating routes which causes pptp to die.
If you look below, you will see that I have routes with a distance of 0 which are added by pptp that should take care of the static route with a lower cost for the pptp encapsulation packets to traverse.
Anyone have any ideas on how to resolve this? Many thanks!
Here is the simple network layout:
Router 1:
pptp server
static public address
Router 2:
pptp client
dynamic wan address which is behind nat
Router 1 settings:
[admin@shark] > /ip address print
Flags: X - disabled, I - invalid, D - dynamic
ADDRESS NETWORK BROADCAST INTERFACE
0 192.168.40.1/24 192.168.40.0 192.168.40.255 ether1
1 10.0.0.1/29 10.0.0.0 10.0.0.7 ether3
2 PPTPSERVERIP/30 PPTPSERVERNETMASK PPTPSERVERBROADCAST ether2
/ppp secret
add caller-id=“” comment=“” disabled=no limit-bytes-in=0 limit-bytes-out=0 local-address=192.168.39.3 name=blackbox
password=blackbox profile=default remote-address=192.168.39.4 routes=“192.168.70.0/24 192.168.39.4” service=any
[admin@shark] > /routing ospf network print
Flags: X - disabled, I - invalid
NETWORK AREA
0 10.0.0.0/29 backbone
1 X 192.168.39.4/32 backbone
[admin@shark] > /routing ospf interface print
Flags: X - disabled, I - inactive, D - dynamic, P - passive
INTERFACE COST PRIORITY NETWORK-TYPE AUTHENTICATION AUTHENTICATION-KEY
0 50 1 broadcast none
1 D ether3 10 1 broadcast none
[admin@shark] > /ip route print
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme,
B - blackhole, U - unreachable, P - prohibit
DST-ADDRESS PREF-SRC GATEWAY-STATE GATEWAY DISTANCE INTERFACE
0 A S ;;; Default Route
0.0.0.0/0 reachable PPTPSERVERGW 1 ether2
1 ADC 10.0.0.0/29 10.0.0.1 0 ether3
2 ADo 10.0.0.8/29 reachable 10.0.0.2 110 ether3
3 ADo 10.0.0.16/29 reachable 10.0.0.2 110 ether3
4 ADo 10.1.0.0/16 reachable 10.0.0.2 110 ether3
5 ADo 63.99.9.0/24 reachable 10.0.0.2 110 ether3
6 ADC 75.140.233.124/30 75.140.233.126 0 ether2
7 ADo 192.168.2.0/24 reachable 10.0.0.2 110 ether3
8 ADC 192.168.39.4/32 192.168.39.3 0
9 ADC 192.168.39.6/32 192.168.39.5 0
10 ADC 192.168.40.0/24 192.168.40.1 0 ether1
11 ADo 192.168.41.0/24 reachable 10.0.0.2 110 ether3
12 ADo 192.168.42.0/24 reachable 10.0.0.2 110 ether3
13 ADo 192.168.43.0/24 reachable 10.0.0.2 110 ether3
14 ADS 192.168.44.0/24 reachable 192.168.39.6 1
15 ADS 192.168.70.0/24 reachable 192.168.39.4 1
Router 2 settings:
[admin@blackbox] > /ip address print
Flags: X - disabled, I - invalid, D - dynamic
ADDRESS NETWORK BROADCAST INTERFACE
0 192.168.70.1/24 192.168.70.0 192.168.70.255 bridge1
1 D 192.168.1.179/24 192.168.1.0 192.168.1.255 wlan1
2 D 192.168.39.4/32 192.168.39.3 0.0.0.0 pptp-out1
[admin@blackbox] > /interface pptp-client print
Flags: X - disabled, R - running
0 R name=“pptp-out1” max-mtu=1460 max-mru=1460 mrru=disabled
connect-to=PPTPSERVERIP user=“blackbox” password=“blackbox”
profile=default-encryption add-default-route=no
allow=pap,chap,mschap1,mschap2
[admin@blackbox] > /routing ospf interface print
Flags: X - disabled, I - inactive, D - dynamic, P - passive
INTERFACE COST PRIORITY NETWORK-TYPE AUTHENTICATION AUTHENTICATION-KEY
0 pptp-out1 50 1 broadcast none
[admin@blackbox] > /routing ospf network print
Flags: X - disabled, I - invalid
NETWORK AREA
0 192.168.39.3/32 backbone
[admin@blackbox] > /ip route print
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme,
B - blackhole, U - unreachable, P - prohibit
DST-ADDRESS PREF-SRC GATEWAY-STATE GATEWAY DISTANCE INTERFACE
0 ADS 0.0.0.0/0 reachable 192.168.1.254 0 wlan1
1 ADC 192.168.1.0/24 192.168.1.179 0 wlan1
2 ADC 192.168.39.3/32 192.168.39.4 0 pptp-out1
3 A S ;;; home route
192.168.40.0/24 reachable 192.168.39.3 1 pptp-out1
4 ADC 192.168.70.0/24 192.168.70.1 0 bridge1