11-10-2009 05:56 AM - edited 03-04-2019 06:39 AM
Hi to All,
Two PPP router links /32 subnet and the links see OSPF hello packets form each other.
Problem:
The client complaints "Rcv pkt from xxx.x.137.65, Dialer2, area 0.0.0.0 : src not on the same network"
Theory:
as there cannot be more than 1 host on a /32 network, OSPF will always complain that the remote peer is not in the same subnet (OSPF needs both the ends in the same network to form neighbour relationship).
Question:
As the dialer 2 interface has a /32 ip and the interface bound to the virtual-template can't be part of that /32 network what the solution to this would be ?
Thanks.
11-10-2009 06:10 AM
Hi,
From your description, I assume you are running PPPoE with address negotiation via IPCP (using "ip address negotiated" on client dialer interface).
If the above is your case, you need to use DHCP for address negotiation and not PPP, as PPP doesn't have option of mask negotiation and client address always end up with /32 address.
Try "ip address dhcp" on client dialer interface and create a DHCP pool on Server side.
HTH,
Nagendra
11-10-2009 06:33 AM
Hi,
thanks for the reply.
I'm using L2TP :
ROUTER 1#
!
interface Loopback0
ip address 192.168.16.51 255.255.255.255
!
interface Tunnel0
description ** backup **
ip address 192.168.18.198 255.255.255.252
ip mtu 1524
tunnel source Loopback0
tunnel destination 192.168.16.1
!
!
interface ATM0
description ** ADSL Internet **
no ip address
ip mtu 1500
load-interval 30
no atm ilmi-keepalive
pvc 8/35
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
dsl operating-mode auto
!
interface BRI0
ip address negotiated
encapsulation ppp
load-interval 30
dialer idle-timeout 180
dialer string 7090811814
dialer-group 1
isdn switch-type basic-net3
no fair-queue
no cdp enable
ppp chap hostname cisco@cisco
ppp chap password 7 11111111
ppp pap sent-username cisco@cisco password 7 11111111
!
interface FastEthernet0
ip address 10.4.7.145 255.255.255.240
load-interval 30
speed auto
no cdp enable
!
interface Dialer0
description ** Ip 195.245.55.55 **
ip address negotiated
ip nat outside
encapsulation ppp
dialer pool 1
ppp authentication chap callin
ppp chap hostname cisco_user1@cisco.com
ppp chap password 7 0019827373705F5D
!
router ospf 50
log-adjacency-changes
redistribute connected subnets
passive-interface BRI0
passive-interface Tunnel0
network 10.10.10.180 0.0.0.3 area 0
!
ROUTER 1#
4d06h: OSPF: Rcv pkt from 10.10.12.1, Dialer0, area 0.0.0.0 : src not on the same network
4d06h: OSPF: Rcv pkt from 10.10.12.1, Dialer0, area 0.0.0.0 : src not on the same network
4d06h: OSPF: Rcv pkt from 10.10.12.1, Dialer0, area 0.0.0.0 : src not on the same network
4d06h: OSPF: Rcv pkt from 10.10.12.1, Dialer0, area 0.0.0.0 : src not on the same network
4d06h: OSPF: Rcv pkt from 10.10.12.1, Dialer0, area 0.0.0.0 : src not on the same network
4d06h: OSPF: Rcv pkt from 10.10.12.1, Dialer0, area 0.0.0.0 : src not on the same network
4d06h: OSPF: Rcv pkt from 10.10.12.1, Dialer0, area 0.0.0.0 : src not on the same network
4d06h: OSPF: Rcv pkt from 10.10.12.1, Dialer0, area 0.0.0.0 : src not on the same network
4d06h: OSPF: Rcv pkt from 10.10.12.1, Dialer0, area 0.0.0.0 : src not on the same network
ROUTER 1#
ROUTER 1#
ROUTER 2#
!
interface Loopback1
ip address 10.10.12.1 255.255.255.255
!
!
interface Virtual-Template1
ip unnumbered Loopback1
ip tcp adjust-mss 1300
no peer default ip address
ppp authentication chap
ppp multilink
!
!
vpdn-group 1
! Default L2TP VPDN group
description ** VPDN ADSL SITES **
accept-dialin
protocol l2tp
virtual-template 1
l2tp tunnel password 7 02666664F18050E2D454C1C0B51
!
!
router ospf 50
log-adjacency-changes
no auto-cost
redistribute ospf 129
passive-interface FastEthernet1/0
passive-interface FastEthernet3/0
network 10.0.0.0 0.255.255.255 area 0
network 192.168.16.0 0.0.0.255 area 0
network 192.168.31.160 0.0.0.3 area 0
default-information originate
!
Regards
11-10-2009 07:32 AM
Hi,
"ip address negotiated" under dialer interafce will use PPP IPCP for address negotiation. This doesnt have the option to negotiate subnet mask and so will have /32 as subnet on dialer interface. With this, OSPF cannot be enabled.
You may have to try "ip address dhcp" on dialer interface and configure the Server as DHCP server and a DHCP pool with subnet as non /32. This will solve your issue.
HTH,
Nagendra
11-10-2009 07:49 AM
As I cannot modify the DHCP configuration are there any other option ?
Regards.
11-11-2009 05:47 AM
Please are there any other option: as I cannot modify the DHCP configuration are there any other option ?
Regards
Roberto Taccon
11-23-2013 02:53 AM
Hi,
May I know what IOS are you using? This problem may relay to IOS version.
Regards,
Aqua
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