08-09-2006 12:40 PM - edited 02-21-2020 01:06 AM
Hi All
In our network we have configured tunnel over NAT setup
this tunnel is flapping continuously
with log meesage CRYPTOSESSION UP & DOWN
Attaching the configuration detail on the remote Side router
there is Crypto Seesion Up & Down log in the Hub Side router
08-09-2006 09:04 PM
Hi
Whats the frequency of the the tunnel flaps ?
When the tunnel goes down can you check whether any of your bri lines are connected ?
I suspect your bri line may be connecting becoz of the EIGRP updtes through them which may cause this flaps.
regds
08-10-2006 06:53 AM
I have shut down the dialer interface
the frequency of flapping is every 2hrs
Regards
Gopi
08-10-2006 10:51 AM
Hi, I am attaching the router logg message of remote site
Aug 10 17:28:19: %CRYPTO-5-SESSION_STATUS: Crypto tunnel is UP . Peer 195.75.9
7.209:4500 Id: 195.75.97.209
Aug 10 17:28:19: %CRYPTO-5-SESSION_STATUS: Crypto tunnel is DOWN. Peer 195.75.9
7.209:4500 Id: 195.75.97.209
Aug 10 17:30:19: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel160, chan
ged state to down
Aug 10 17:30:19: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 165.204.14.205 (Tunn
el160) is down: interface down
Aug 10 17:31:28: %CRYPTO-5-SESSION_STATUS: Crypto tunnel is UP . Peer 195.75.9
7.209:4500 Id: 195.75.97.209
Aug 10 17:31:28: %CRYPTO-5-SESSION_STATUS: Crypto tunnel is DOWN. Peer 195.75.9
7.209:4500 Id: 195.75.97.209
Aug 10 17:31:59: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel160, chan
ged state to up
Aug 10 17:32:36: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 165.204.14.205 (Tunn
el160) is up: new adjacency
08-11-2006 08:15 AM
Your crypto map is applied on the GRE tunnel and F0/1. IT should be applied only on the F0/1. You can have only one instance of the same IPSEC tunnel UP!
Let me know if this solved the problem,
Regards,
08-11-2006 09:18 AM
Hi, I will remove crypto map GRE from tunnel interface
but i have one doubt there are all other sites running from HUB side router, which are running without any problem
Attaching one configuration for reference
HUB Side:
interface Tunnel150
description Primary GRE to Milan
bandwidth 512
ip address 165.204.14.105 255.255.255.252
ip mtu 1400
ip route-cache flow
ip tcp adjust-mss 1360
no ip mroute-cache
load-interval 30
delay 1000
shutdown
qos pre-classify
keepalive 5 5
tunnel source FastEthernet0/1
tunnel destination 194.196.23.242
crypto map GRE
REMOTE Side:
interface Tunnel152
description Primary GRE to drsfso-vpn1
bandwidth 2048
ip address 165.204.14.110 255.255.255.252
ip mtu 1400
ip route-cache flow
ip tcp adjust-mss 1360
no ip mroute-cache
load-interval 30
delay 1000
qos pre-classify
keepalive 5 5
tunnel source FastEthernet0/1
tunnel destination 195.75.97.209
crypto map GRE
Regards
Gopinath.V
08-11-2006 11:19 AM
Well, GRE will be passed based on the source and destination of the tunnel. I don't think the crypto map is matching the GRE on the tunnel. When traffic reaches the GRE it is clear IP packet. When it wants to leave the GRE tunnel from the source to the destination it is encapsulated by GRE. Therefore, your crypto map should be applied on the source of the GRE because here where the match would happen.
IN your configuration the crypto map applied on the F0/0 is matching traffic not the crypto map applied on the GRE tunnels.
Try removing the crypto map from the GRE tunnels and you will see that the IPSEC tunnel will still pass traffic which validates what I am saying.
Let me know if removing the crypto map solves the prob,
Regards,
08-14-2006 08:14 AM
Hello,
I am eager to know what is the status?
Thanks,
08-14-2006 10:21 AM
Hi, Yes i have removed the crypto map from the tunnel & applied only in Fastethernet but the tunnel is still flapping
with the same log messages:
Aug 14 17:28:55: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 165.204.14.205 (Tunn
el160) is down: interface down
Aug 14 17:29:33: %CRYPTO-5-SESSION_STATUS: Crypto tunnel is UP . Peer 195.75.9
7.209:4500 Id: 195.75.97.209
Aug 14 17:29:33: %CRYPTO-5-SESSION_STATUS: Crypto tunnel is DOWN. Peer 195.75.9
7.209:4500 Id: 195.75.97.209
Aug 14 17:29:55: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel160, chan
ged state to up
Aug 14 17:30:21: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 165.204.14.205 (Tunn
el160) is up: new adjacency
Configuration Detail
dubai-vpn1#sh running-config interface tunnel 160
Building configuration...
Current configuration : 388 bytes
!
interface Tunnel160
description Primary GRE to drsfso-vpn1
bandwidth 512
ip address 165.204.14.206 255.255.255.252
ip mtu 1400
ip hello-interval eigrp 1 40
ip hold-time eigrp 1 220
ip route-cache flow
ip tcp adjust-mss 1360
no ip mroute-cache
load-interval 30
delay 1000
qos pre-classify
keepalive 20 5
tunnel source FastEthernet0/1
tunnel destination 195.75.97.209
end
Regards
Gopinath.V
08-14-2006 12:19 PM
Hello,
I checked the whole config and found that what is happening is correct. If you look at the configuration who have set the life time of the SA to be 7200 which equivalent to 2hours. Make sure you have the same SA life time on both sides!
One thing to try is increase the life time to 28800 and you will see that the IPSEC will not time out after 2 hours or 7200 seconds.
Please let me know what happens,
Regards
08-14-2006 05:32 PM
Hello,
I checked the whole config and found that what is happening is correct. If you look at the configuration you have set the life time of the SA to be 7200 which equivalent to 2hours. Make sure you have the same SA life time on both sides!
One thing to try is increase the life time to 28800 and you will see that the IPSEC will not time out after 2 hours or 7200 seconds.
Please let me know what happens,
Regards
08-14-2006 06:10 PM
Hi, I have changed the lifetime setting at both the side to 28800
tunnel is up since 45min
let you know the result
Regards
Gopinath.V
08-15-2006 10:49 AM
Hi, inspite of changing the lifetime to 28800 at both end
the tunnel is still flapping almost every 2hrs
the log message is also same
Regards
Gopinath.V
08-16-2006 08:17 AM
Hello,
Can you attach the HUB site config. I can see nothing wrong on the Spoke site!
Regards,
08-16-2006 11:30 AM
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