Trying to remove split tunneling from Cisco ASA, need guidance/help

Steven Hoong
Steven Hoong used Ask the Experts™
on
Currently we have a Cisco ASA 5512-x and we have split tunneling for VPN. Due to issues it's causing for many of our devs at home (they need to vpn into our network then route over to aws), we want to remove split tunneling.

  1. How do I go about removing split tunneling?
  2. Are there any got chas that I need to look out for? Will this potentially break routing anywhere else?

I don't have a deep understanding of networking, but I am comfortable getting into the Cisco ASA and making configuration changes.
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JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
Split tunneling is normally a function of the client application (not the VPN router). There is normally a setting for that in the client app (I use NCP Secure Entry).

For the Cisco client app, I found this. Quote:

"Choose Configuration > Remote Access VPN > Network (Client) Access > Group Policies, and choose the Group Policy in which you want to enable local LAN access. ...
Click Split Tunneling"

Now, since this is a client app setting, make sure you need to disable split tunneling. That has nothing to do with the ability to router somewhere else in the network.

Can you talk to AWS directly?
Technical Consultant
Commented:
It will be set in the [cisco] group policy on the firewall :)

On the ASA do the following;

show run group-policy

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Find the one the developers are using it will have lines in it that looks like

split-tunnel-policy tunnelspecified
split-tunnel-network-list value {name-of-the-access-list}

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Just remove those two lines from the group policy e.g.

PeteASA(config)# group-policy {policy-name} attributes
PeteASA(config-group-policy)# no split-tunnel-policy tunnelspecified
PeteASA(config-group-policy)# no split-tunnel-network-list value Split-Tunnel
PeteASA(config-group-policy)# exit

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Then ask them to disconnect and reconnect :)

For Cisco Remote VPNs split tunnelling us configured on the firewall itself.
Cisco ASA – Enable Split Tunnel for IPSEC / SSLVPN / AnyConnect Clients

I don't use the ASDM, but if you find the group-policy in there, on its properties there's a tick box that says 'tunnel networks listed below" (or something like that) just untick that, and click apply, that will do the same thing :)

Pete
Distinguished Expert 2017

Commented:
as others noted..

how did you configure the vpn?
change to sercureall

note you may have to do additional configuration to allow vpn connecting users access through the vpn out.

not sure why the developers connect to their internal system via the vpn connection eliminating all this..

it will on the developer side, all they will be able to access when the VPN is establish is what you allow.
Pete LongTechnical Consultant

Commented:
How are you getting on?

Commented:
also do not forget to allow the sslvpn ip range to nat to the outside to permit the users internet access when needed.
this is most time required when using tunnel all

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