How to get several standard via ipsec vpn subnet?

Dear all,

I have this scenario:

A - Hand router

Cisco 881

private network: 10.10.10.0/24

private address: 10.10.10.2

address: xxx.xxx.xxx.xxx

B branch office router

DrayTek vigor 2600

private network: 100.100.100.0/24

private address: 100.100.100.1

sound: .yyy

C - seat router

range Cisco 1800 (no access - not mine)

private network: 10.10.10.0/24

private address: 10.10.10.1

D another subnet in HQ

private network: 10.20.20.0/24

available in C

There is a standard VPN ipsec from A to B due interoperability and compatibility between cisco and draytek. the vpn is in place and works very well.

D is accessible from a C: hole

#ping router ip 10.20.20.15 source vlan 1

Type to abort escape sequence.
Send 5, echoes ICMP 100 bytes to 10.20.20.15, wait time is 2 seconds:
Packet sent with the address 10.10.10.2 source
!!!!!
Success rate is 100 per cent (5/5), round-trip min/avg/max = 52/56/64 ms

Now, I need reach D from B.

I configured adding the 10.20.20.0/24 routing via vpn subnet B and tested the connection replacing the cisco 881 (A) with an another drytek vigor 2820; Add a static route in the drytek 2820 (10.20.20.0 via 10.10.10.1) make B able to reach successfully the D with ping 10.20.20.15.

After that I tried to divide the acl of tunnel and ping in vain 10.20.20.15 d, I noticed a match in acl:

Router #sh ip access list 101
Expand the access IP 101 list
10 permit ip 10.10.10.0 0.0.0.255 100.100.100.0 0.0.0.255 (3298 matches)
20 permit ip 10.20.20.0 0.0.0.255 100.100.100.0 0.0.0.255 (14 matches)

I also tried to prevent NAT from D to B without any match in acl after unsuccessful ping 10.20.20.15 d.

Any suggestion is appreciated.

Gianluca

Hanks for the additional info

So what is happening is the traffic is not getting encrypted, it is hitting the crypto acl but not getting not encrypted

I know you would have checked it already, but please just check once more the entrance to nat and see if you have a deny for this traffic in the acl, nat

We need to know why the tunnel isn't coming for this traffic

could you please confirm wht is crypto ACLs on the other end, that's exactly the mirror image (2 acl), I don't know how the configuration is made at the other end

give the following debug command

Debug ip counterpart condition crypto / / if you have several tunnels will do conditional debugging

Crypto ipsec its debug debug crypto or her (who was never there I think it's a bit confusing)

one thing you can try if down the tunnel is also an option, just erase this tunnel using cry clear isa his id and disable remote session encryption and bring it and see if it happens

Finally, given that I don't know how the other end is configured just try this as the encryption, ACLs on both ends

10.0.0.0 0.255.255.255 100.100.100.0 0.0.0.255

and the reverse on the other end and now try to brining of the tunnel to the top

Tags: Cisco Security

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