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Site to Site tunnel - Allow VPN clients to access the other site.

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skandatalogin
Level 1
Level 1

‎09-11-2011 07:10 AM

Hi

How do i get this to work?

I want to allow the VPN clientens connecting into the Cisco ASA to access the 10.50.50.0 network.

Infomation about the network:

I have a Site to Site IPSec VPN connection that the Zywall 5 and USG 100 makes(148.148.0.0 and 10.50.50.0). Working fine both ways.

I have the Cisco ASA for VPN clients, clients gets a 10.210.210.0 /24 ip-adresse, and its working fine for accessing the 148.148.0.0 /16 network.
The 148.148.0.235 is the main firewall/router for the 148.148.0.0 network.
I have created a static route in the 148.148.0.235, telling that for access to the 10.210.210.0 network goto 148.148.0.168.
I have created a static route in the 148.148.0.168, telling that for access to the 10.50.50.0 network goto 148.148.0.235(I can ping 10.50.50.1 from the Cisco box)
I have created a secound site to site on the Zywall 5 and USG 100 that tunnels the 10.50.50.0 and 10.210.210.0.

In the Cisco ASA splittunneling i have allowed access to the 148.148.0.0 /16 network and the 10.50.50.0 /24 network.


network.png

When i open up the VPN client and connects to the network, and try to ping the 10.50.50.0 network i am getting the following error:

(Here i am trying to ping 10.50.50.1)

5          Sep 11 2011          12:36:09          305013          10.50.50.1                                        Asymmetric NAT rules matched for forward and reverse flows; Connection for icmp src outside:10.210.210.34 dst inside:10.50.50.1 (type 8, code 0) denied due to NAT reverse path failure

I have try to make different NAT rules, but it dont change a thing.

Can any help me, what to do, to make it working?

Thanks.

Simon

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Mohammad Alhyari
Cisco Employee
Cisco Employee
In response to skandatalogin

‎09-11-2011 08:24 AM

hi ,

add this :

nat (inside,outside) source static Vejle Vejle destination static obj-10.210.210.0 obj-10.210.210.0

and let me know if it works

HTH

Mohammad.

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Mohammad Alhyari
Cisco Employee
Cisco Employee

‎09-11-2011 07:43 AM

Hi Simon ,

thanks for posting this here .

you have done most of the job , can you please post your NAT configuration here since that NAT RPF is responsible for dropping the packet !

cheers !

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skandatalogin
Level 1
Level 1
In response to Mohammad Alhyari

‎09-11-2011 07:52 AM

Here is the full conf, some parts are removed(Ip-adresses and secrets)

ASA Version 8.3(1)

  !

  hostname ciscoasa

  domain-name test.local

  enable password xxxxxxxxxxxxxx encrypted

  passwd xxxxxxxxxxxxxxx encrypted

  names

  !

  interface Vlan1

  nameif inside

  security-level 100

  ip address 148.148.0.163 255.255.0.0

  ospf cost 10

  !

  interface Vlan2

  nameif outside

  security-level 0

  ip address xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx

  ospf cost 10

  !

  interface Vlan3

  shutdown

  nameif dmz

  security-level 50

  ip address dhcp

  ospf cost 10

  !

  interface Ethernet0/0

  switchport access vlan 2

  !

  interface Ethernet0/1

  !

  interface Ethernet0/2

  !

  interface Ethernet0/3

  !

  interface Ethernet0/4

  !

  interface Ethernet0/5

  !

  interface Ethernet0/6

  !

  interface Ethernet0/7

  !

  boot system disk0:/asa831-k8.bin

  ftp mode passive

  clock timezone CEST 1

  clock summer-time CEDT recurring last Sun Mar 2:00 last Sun Oct 3:00

  dns server-group DefaultDNS

  domain-name test.local

  object network obj-148.148.0.0

  subnet 148.148.0.0 255.255.0.0

  object network obj-10.210.210.0

  subnet 10.210.210.0 255.255.255.0

  object network obj_any

  subnet 0.0.0.0 0.0.0.0

  object network Vejle

  subnet 10.50.50.0 255.255.255.0

  object network VPN

  subnet 10.210.210.0 255.255.255.0

  description VPN

  access-list Test_VPN_splitTunnelAcl standard permit 148.148.0.0 255.255.0.0

  access-list Test_LAN_splitTunnelAcl standard permit 148.148.0.0 255.255.0.0

  access-list Test_VPN_splitTunnelAcl_1 standard permit 148.148.0.0 255.255.0.0

  access-list Test_VPN_splitTunnelAcl_2 standard permit 148.148.0.0 255.255.0.0

  access-list Test_VPN_splitTunnelAcl_2 remark Vejle

  access-list Test_VPN_splitTunnelAcl_2 standard permit 10.50.50.0 255.255.255.0

  access-list inside_nat0_outbound extended permit ip 148.148.0.0 255.255.0.0 10.210.210.0 255.255.255.0

  access-list inside_nat0_outbound extended permit ip 10.50.50.0 255.255.255.0 10.210.210.0 255.255.255.0

  pager lines 24

  mtu inside 1500

  mtu outside 1500

  mtu dmz 1500

  ip local pool Test_VPN_IP 10.210.210.1-10.210.210.254 mask 255.255.255.0

  no failover

  icmp unreachable rate-limit 1 burst-size 1

  asdm image disk0:/asdm-631.bin

  no asdm history enable

  arp timeout 14400

  nat (inside,any) source static obj-148.148.0.0 obj-148.148.0.0 destination static obj-10.210.210.0 obj-10.210.210.0

    !

  object network obj_any

  nat (inside,outside) dynamic interface

  access-group outside_access_in in interface outside

  route outside 0.0.0.0 0.0.0.0 xxx.xxx.xxx.xxx 255

  route inside 10.50.50.0 255.255.255.0 148.148.0.235 1

  timeout xlate 3:00:00

  timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02

  timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00

  timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00

  timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute

  timeout tcp-proxy-reassembly 0:01:00

  dynamic-access-policy-record DfltAccessPolicy

  http server enable

  http 148.148.0.0 255.255.0.0 inside

  no snmp-server location

  no snmp-server contact

  snmp-server enable traps snmp authentication linkup linkdown coldstart

  crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac

  crypto ipsec security-association lifetime seconds 28800

  crypto ipsec security-association lifetime kilobytes 4608000

  crypto dynamic-map outside_dyn_map 20 set pfs group1

  crypto dynamic-map outside_dyn_map 20 set transform-set ESP-3DES-SHA

  crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map

  crypto map outside_map interface outside

  crypto isakmp enable outside

  crypto isakmp policy 10

  authentication pre-share

  encryption 3des

  hash sha

  group 2

  lifetime 86400

  crypto isakmp ipsec-over-tcp port 10000

  ssh timeout 5

  console timeout 0

  dhcpd auto_config outside

  !

  threat-detection basic-threat

  threat-detection statistics access-list

  no threat-detection statistics tcp-intercept

  webvpn

  group-policy Test_VPN internal

  group-policy Test_VPN attributes

  wins-server none

  dns-server value xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx

  vpn-tunnel-protocol IPSec

  split-tunnel-policy tunnelspecified

  split-tunnel-network-list value Test_VPN_splitTunnelAcl_2

  default-domain value Test.net

  split-dns value Test.net

  tunnel-group Test_VPN type remote-access

  tunnel-group Test_VPN general-attributes

  address-pool Test_VPN_IP

  authentication-server-group Test

  default-group-policy Test_VPN

  tunnel-group Test_VPN ipsec-attributes

  pre-shared-key XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

  !

  !

  prompt hostname context

  Cryptochecksum:ef40a92065ff3064a61b9872bacd9abe

  : end

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Mohammad Alhyari
Cisco Employee
Cisco Employee
In response to skandatalogin

‎09-11-2011 08:24 AM

hi ,

add this :

nat (inside,outside) source static Vejle Vejle destination static obj-10.210.210.0 obj-10.210.210.0

and let me know if it works

HTH

Mohammad.

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skandatalogin
Level 1
Level 1
In response to skandatalogin

‎09-11-2011 11:14 AM

Works great

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Mohammad Alhyari
Cisco Employee
Cisco Employee
In response to skandatalogin

‎09-11-2011 11:22 AM

thanks for the confirmation

anytime mate!!!!!!!!!!!!!!!!!!!!!!!!!!!

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Harish Inuganti
Level 1
Level 1
In response to Mohammad Alhyari

‎05-23-2012 08:38 AM

Hello. I am working on getting site to site vpn tunnel built between a 2811 router and UC-540. I have some issues with defining access-lists. The private ip's on both the ends are in same range. Not sure on how to define access-lists and got an error while defining these access-lists.

2811 privae ip's- 10.1.0.0 0.0.255.255, 192.168.0.0 0.0.255.255

UC-540 private ip's- 10.1.1.0 0.0.0.255 192.168.10.0 0.0.0.255

Ho can i define valid access-lists in this case.

As of now i tried doing this

ip access-list extended VPN_To_XXXXX_Allowed

permit ip 192.168.0.0 0.0.255.255 10.1.1.0 0.0.0.255

permit ip 10.1.0.0 0.0.255.255 10.1.1.0 0.0.0.255

permit ip 192.168.0.0 0.0.255.255 192.168.10.0 0.0.0.255

permit ip 10.1.0.0 0.0.255.255 192.168.10.0 0.0.0.255

permit ip 10.1.1.0 0.0.0.255 192.168.0.0 0.0.255.255

permit ip 10.1.1.0 0.0.0.255 10.1.0.0 0.0.255.255

permit ip 192.168.10.0 0.0.0.255 192.168.0.0 0.0.255.255

permit ip 192.168.10.0 0.0.0.255 10.1.0.0 0.0.255.255

deny   ip any any

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rishabh2506137
Level 1
Level 1
In response to skandatalogin

‎02-15-2013 07:26 PM

Can anyone please tell me the order of operation for these:

inbound ACL, NAT, interesting traffic, routing, outbound ACL.

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