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site to site VPN ACL ?

Posted on 2014-07-21
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Last Modified: 2014-09-08
dear experts,

ACL for my VPN are given below:

on Head Office:
ip access-list extended ACL_VPN_HO_TO_BR
 permit ip 192.168.1.0 0.0.0.255 192.168.100.0 0.0.0.255
 permit ip 192.168.2.0 0.0.0.255 192.168.100.0 0.0.0.255

on Branch Office:
ip access-list extended ACL_VPN_BR_TO_HO
 permit ip 192.168.100.0 0.0.0.255 192.168.1.0 0.0.0.255
 permit ip 192.168.100.0 0.0.0.255 192.168.2.0 0.0.0.255

but the communication is only between 192.168.100.0/24 and 192.168.2.0/24
but not have communication between 192.168.100.0/24 and 192.168.1.0/24

what could be wrong or crypto map allow only single entry ACL?
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Question by:nainasipra
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7 Comments
 
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Accepted Solution

by:
Pete Long earned 500 total points
ID: 40211327
What version are you running? 'sho ver'.
Remember just because the ACL for the cryptomaps are correct does not mean that traffic will flow!

At a guess I would check you have a 'Nat Exemption' for the 192.168.100.0/24 and 192.168.1.0/24 networks.
how that's done differs depending on what version you are running (hence my first question)

you should either have a no nat acl like this (note your ACL name may be different, show nat will tell you....... (version 8.2 and older)
access-list inside_nat0_outbound extended permit ip 192.168.100.0 255.255.255.0 192.168.1.0 255.255.255.0
OR
(version 8.3 and newer)
object network NETWORK_OBJ_192.168.100_24
 subnet 192.168.100.0 255.255.255.0
object network NETWORK_OBJ_192.168.1.0_24
 subnet 192.168.1.0 255.255.255.0
nat (inside,outside) source static  NETWORK_OBJ_192.168.100_24  NETWORK_OBJ_192.168.100_24 destination static NETWORK_OBJ_192.168.1.0_24 NETWORK_OBJ_192.168.1.0_24 no-proxy-arp route-lookup

Regards,

Pete
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LVL 9

Expert Comment

by:Sandeep Gupta
ID: 40216390
it should work..

can you please allow also in the acl

permit gre <<source range>> <<destination range>>

try rebooting ur router as well.
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LVL 9

Expert Comment

by:Sandeep Gupta
ID: 40216392
if you have loopback0 (management ip)..just allow that also in acl

permit ip <<loopback0 IP>> any
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Author Comment

by:nainasipra
ID: 40216481
my GRE acl is :
!
!
ip access-list extended SDM_GRE
 remark CCP_ACL Category=1
 permit gre any any
!
0
 
LVL 9

Expert Comment

by:Sandeep Gupta
ID: 40218621
where you have applied it?

can you share all the relevant config?
0
 

Author Comment

by:nainasipra
ID: 40218990
dear sandeep,

I have not applied GRE ACL any where, but i can see it in configuration.
these are total entries exisit, please check and help me if it has any effects on VPN.
:::::
!
class-map type inspect match-all SDM_GRE
 match access-group name SDM_GRE
!
ip access-list extended SDM_GRE
 remark CCP_ACL Category=1
 permit gre any any
!

and what if I will remove SDM_GRE ACL from configuration.

Thanks,
0
 
LVL 9

Expert Comment

by:Sandeep Gupta
ID: 40248001
class map you have defined as 'inspect'...basically your ACL is not performing for interesting traffic..I can help you more if you could share your complete config?

I am not able to see what ACL are working for interesting traffic.


Also one or more ACL can be defined as interesting traffic.
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