Problem with "vpn sysopt connection permit.
Hi all
I would like to ask you for advice with "vpn sysopt connection permit". I have a problem with by-pass-access list (acl) in the INSIDE interface. As I understand it and I'm going to use this command, there is no need to especialy allow traffic in the access list for the INSIDE and I can control the filter-vpn traffic. But in my case it's quite the opposite, I want particularly to this INTERIOR acl traffi. When I allow this traffic inside acl L2L tunnel rises, hollow traffic flow vpn-fltr ane acl that everything is OK. But when I do not allow that this traffic is inside of the rule with Deny statement in acl INSIDE block traffic and tunnel goes ever upward. Part of the configuraciton which you can view below.
Please let me know if I'm wrong, or what I did wrong?
Thank you
Karel
PHA-FW01 # view worm | Worm Inc
Cisco Adaptive Security Appliance Software Version 4,0000 1
PHA-FW01 # display ru all sys
No timewait sysopt connection
Sysopt connection tcpmss 1380
Sysopt connection tcpmss minimum 0
Sysopt connection permit VPN
Sysopt connection VPN-reclassify
No sysopt preserve-vpn-stream connection
no RADIUS secret ignore sysopt
No inside sysopt noproxyarp
No EXT-VLAN20 sysopt noproxyarp
No EXT-WIFI-VLAN30 sysopt noproxyarp
No OUTSIDE sysopt noproxyarp
PHA-FW01 # display the id of the object-group ALGOTECH
object-group network ALGOTECH
object-network 10.10.22.0 255.255.255.0
host of the object-Network 172.16.15.11
PHA-FW01 # show running-config id of the object VLAN20
network of the VLAN20 object
subnet 10.1.2.0 255.255.255.0
L2L_to_ALGOTECH list extended access permitted ip object object-group VLAN20 ALGOTECH
extended access list ACL-ALGOTECH allow ip object-group object VLAN20 ALGOTECH
Note EXT-VLAN20 of access list =.
access list EXT-VLAN20 allowed extended ip object VLAN20 ALGOTECH #why object-group must be the rule here?
access list EXT-VLAN20 extended permitted udp object VLAN20 object-group OUT-DNS-SERVERS eq field
EXT-VLAN20 allowed extended VLAN20 object VPN-USERS ip access list
EXT-VLAN20 extended access list permit ip object VLAN20 OPENVPN-SASPO object-group
EXT-VLAN20 allowed extended object VLAN10 VLAN20 ip access list
deny access list extended VLAN20 EXT ip no matter what LOCAL NETS of object-group paper
EXT-VLAN20 allowed extended icmp access list no echo
access list EXT-VLAN20 allowed extended object-group SERVICE VLAN20 object VLAN20 everything
EXT-VLAN20 extended access list deny ip any any newspaper
extended access list ACL-ALGOTECH allow ip object-group object VLAN20 ALGOTECH
GROUP_POLICY-91 group policy. X 41. X.12 internal
GROUP_POLICY-91 group policy. X 41. X.12 attributes
value of VPN-filter ACL-ALGOTECH
Ikev1 VPN-tunnel-Protocol
tunnel-group 91.X41. X.12 type ipsec-l2l
tunnel-group 91.X41. X.12 General attributes
Group Policy - by default-GROUP_POLICY-91. X 41. X.12
tunnel-group 91.X41. X.12 ipsec-attributes
IKEv1 pre-shared-key *.
PHA-FW01 # show running-config nat
NAT (EXT-VLAN20, outdoors) static source VLAN20 VLAN20 static destination ALGOTECH ALGOTECH non-proxy-arp-search to itinerary
network of the VLAN20 object
dynamic NAT interface (EXT-VLAN20, outdoors)
group-access to the INTERIOR in the interface inside
Access-group interface VLAN20 EXT EXT-VLAN20
Hello
The command "sysopt connection permit-vpn" is the default setting and it applies only to bypass ACL interface to the interface that ends the VPN. It would be connected to the external network interface. This custom has no effect on the other interfaces ACL interface.
So if you initiate or need to open connections from your local network to remote network through the VPN L2L connection then you will need to allow this traffic on your LAN interface ACL networks.
If the situation was that only the remote end has launched connections to your network then 'sysopt permit vpn connection' would allow their connections around the external interfaces ACL. If If you have a VPN configured ACL filter, I think that the traffic will always accompany against this ACL.
Here are the ASA reference section to order custom "sysopt"
http://www.Cisco.com/en/us/docs/security/ASA/command-reference/S21.html#wp1567918
-Jouni
Tags: Cisco Security
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