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Split-DNS with ezvpn between 1811 and 2921 fails

MARK CASEY
Level 1
Level 1

Hi All

I have a 1811 configured with ezvpn in nem connecting to a 2921.

The connection establishes perfectly, the split-network works and I can access all systems withing the internal network. DNS on the 1811 works for the ISP and if I do an nslookup on the remote dns servers from a client that the 1811 it works.

 

My configuration is as follows, things in [] have been changed for security

 

The group section of the 2921 router is set as

crypto isakmp client configuration group [mygroupname]
 key [mysetkey]
 dns 10.242.1.6 10.242.1.5
 domain office.pegasustech.com.au
 pool pegasus-pool
 acl PEGASUSSTAFFREMOTE-access
 save-password
 split-dns office.pegasustech.com.au
 split-dns pegasustech.com.au
 max-users 10

 

 

The relevant configuration on the 1811 is

 

crypto ipsec client ezvpn pegasus-connect
 connect auto
 group [mygroupname] key [mysetkey]
 mode network-extension
 peer [mypeerip]
 username [myusername] password [mypassword]
 xauth userid mode local

 

When the vpn connects with the following debug

debug ip dns name-list

debug ip dns view

debug ip dns view-list

 

the output is

 

Feb  3 15:28:47.791 Sydney: %CRYPTO-6-EZVPN_CONNECTION_UP: (Client)  User=[myusername] Group= [mygroupname] Client_public_addr=192.168.1.9  Server_public_addr=[mypeerip] NEM_Remote_Subnets=10.242.129.0/255.255.255.0
Feb  3 15:28:47.791 Sydney: DNS_VIEW: creating view ezvpn-internal-view
DNS_VIEW: Setting  domain name-server 10.242.1.6 10.242.1.5 in view ezvpn-internal-view
Feb  3 15:28:47.791 Sydney: DNS_NAMELIST: adding permit 'OFFICE.PEGASUSTECH.COM.AU' to name-list 1
Feb  3 15:28:47.791 Sydney: DNS_NAMELIST: adding permit 'PEGASUSTECH.COM.AU' to name-list 1
Feb  3 15:28:47.791 Sydney: DNS_VIEWLIST: creating view-list ezvpn-internal-viewlist internal
Feb  3 15:28:47.791 Sydney: DNS_VIEWLIST: adding member ezvpn-internal-view order 10 to view-list ezvpn-internal-viewlist
Feb  3 15:28:47.791 Sydney: DNS_VIEWLIST: adding member default order 20 to view-list ezvpn-internal-viewlist
Feb  3 15:28:47.791 Sydney: DNS_VIEWLIST: setting internal internal view-list ezvpn-internal-viewlist on interface BVI1
pegasus-casey-01(config-crypto-ezvpn)#
DNS_VIEW: Setting  domain name-server 10.242.1.6 10.242.1.5 in view ezvpn-internal-view
Feb  3 15:28:58.271 Sydney: DNS_NAMELIST: adding permit 'OFFICE.PEGASUSTECH.COM.AU' to name-list 2
Feb  3 15:28:58.271 Sydney: DNS_NAMELIST: adding permit 'PEGASUSTECH.COM.AU' to name-list 2
Feb  3 15:28:58.271 Sydney: DNS_NAMELIST: removing name-list 2
DNS_VIEW: Setting  domain name-server 10.242.1.6 10.242.1.5 in view ezvpn-internal-view
Feb  3 15:28:58.271 Sydney: DNS_NAMELIST: adding permit 'OFFICE.PEGASUSTECH.COM.AU' to name-list 2
Feb  3 15:28:58.271 Sydney: DNS_NAMELIST: adding permit 'PEGASUSTECH.COM.AU' to name-list 2
Feb  3 15:28:58.271 Sydney: DNS_NAMELIST: removing name-list 2

The name-list is visible

pegasus-casey-01#show ip dns name-list
ip dns name-list 1
    permit OFFICE.PEGASUSTECH.COM.AU
    permit PEGASUSTECH.COM.AU

 

The view list is empty, i beleve it should show  ezvpn-internal-view

#show ip dns view-list

#

 

And the show views only shows the default view

 

show ip dns view
DNS View default parameters:
Logging is off
DNS Resolver settings:
  Domain lookup is enabled
  Default domain name: casey.pegasustech.com.au
  Domain search list:
  Lookup timeout: 3 seconds
  Lookup retries: 2
  Domain name-servers:
    192.168.1.1
DNS Server settings:
  Forwarding of queries is enabled
  Forwarder timeout: 3 seconds
  Forwarder retries: 2
  Forwarder addresses:

 

With the vpn enabled, nslookup for www.pegasustech.com.au returns failed

the 1811 router shows

DNS View ezvpn-internal-view used for client 10.242.129.20/51934, querying A 'www.pegasustech.com.au'

 

However when I disconnect the name list and view list seem to be being deleted

 

Feb  3 15:57:57.478 Sydney: DNS_VIEWLIST: deleting view-list ezvpn-internal-viewlist
Feb  3 15:57:57.478 Sydney: DNS_VIEW: deleting view ezvpn-internal-view
Feb  3 15:57:57.478 Sydney: DNS_NAMELIST: removing name-list 1
Feb  3 15:57:57.478 Sydney: DNS_VIEWLIST: removing internal view-list  on interface BVI1
Feb  3 15:57:57.478 Sydney: %CRYPTO-6-EZVPN_CONNECTION_DOWN: (Client)  User=[myusername] Group= [mygroupname] Client_public_addr=192.168.1.9  Server_pu

 

It all looks to be working, except there is no ezvpn-internal-view  active

Anyone got any ideas ?

 

Thanks in advance

Mark

1 Reply 1

MARK CASEY
Level 1
Level 1

Hi All

Just an update

Has anyone got ezvpn split-dns in 'network extension mode' working with any system ?

 

Because I am seeing the same

with clients

877,887, 1811

with servers

2921 and ASA 5510

 

I an seeing exactly the same across all three clients to the 1921 and the 877 to both types of servers.

 

 

 

 

 

 

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