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Any one know how to hack the routing table (on a mac) to defeat the forcing of VPN routing for every thing over a cisco VPN? pretty much what I want to do is have only 10.121.* and 10.122.* addresses over the VPN and everything else straight to the internet.
Sathyajith BhatStep 1 Install Cisco anyconnect VPN client for Mac OS X. Double click on AnyConnect. If you see the message: “This package will run a program to determine if.
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user23601
7 Answers
The following works for me. Run these after connecting to the Cisco VPN. (I'm using OS X's built-in Cisco client, not the Cisco branded client.)
Replace
10
in the first command with the network that's on the other side of the tunnel.Replace
192.168.0.1
with your local network's gateway.I put it into a bash script, like this:
I also found an explanation on how to run this automatically when you connect the VPN, but it's late on Friday and I don't feel like trying it :)
Edit:
I have since left the job where I was using the Cisco VPN, so this is from memory.
The
10
in the first command is the network that you want to route over the VPN. 10
is short hand for 10.0.0.0/8
. In Tuan Anh Tran's case, it looks like the network is 192.168.5.0/24
.As for which gateway to specify in the second command, it should be your local gateway. When you log into a VPN that prevents split-tunneling, it is enforcing that policy by changing your routing tables so that all packets are routed on the virtual interface. So you want to change your default route back to what it was prior to getting on the VPN.
The easiest way to figure out the gateway is to run
netstat -rn
before logging into the VPN, and look at the IP address to the right of the 'default' destination. For example, here's what it looks like on my box right now:My gateway is
10.0.1.1
— it is to the right of the 'default' destination.Community♦
Mark E. HaaseMark E. Haase2,9331 gold badge14 silver badges17 bronze badges
Using the information from mehaase, I wrote a Python script that really simplifies this process on the Mac. When you run it, the script will save your firewall info, launch the AnyConnect client, wait for login, then fix the routes and firewall. Just run the script from 'terminal'.
Community♦
user652641user652641
The Python script in this previous answer was helpful, however, it didn't take care of the routes that AnyConnect used to take over other interfaces on the device (such as VMware interfaces). It also wasn't able to handle multiple VPN networks.
Here is the script I use:
robinCTS4,0954 gold badges16 silver badges27 bronze badges
Kate GrayKate Gray
More than likely your admin should want to set up VPN connections to use local routing for the 10.121.* and 10.122.* subnets and let the remote (your home machine) route all the rest of the requests. (it saves them bandwidth and liability)
Are you using the Cisco's 'VPN Client'? os OS X?
if you use OS X's VPN (set up via the networking Preference Pane) you should be able to click 'advanced' and select the 'VPN on Demand' tab. then supply the necessary subnets for the VPN to use.
ToymakeriiToymakerii
I wanted a native 'app' that I can run at logon (and keep running/hidden) to enable Split Tunnel routing, similar to a function of Locamatic. Perhaps I'll fork Locamatic at some point and play with it. I may also upload this AppleScript to Github. I didn't want to mess with a daemon as this answer suggests.
This script assumes VPN has default
VPN (Cisco IPSec)
name and VPN route is 10.10.10.1/22
>10.10.20.10
. These will need to be changed/additional routes added. Run terminal >netstat -rn
when VPN is connected (prior to enabling this script) to see VPN-added routes. This script also generates growl-style notifications in Notification Center :)
I ran into some issues with Mark E. Haase's answer as my Cisco VPN modifies the existing gateway from a
UCSc
to a UGScI
(en0 interface specific) route and adds the VPN gateway as a UCS
route, necessitating the deletion of two default gateways and adding back the original UGSc
default gatewayThank goodness for StackExchange/google, this is my first AppleScript and I wouldn't have been able to put it together without a few hours of googling.
Suggestions/corrections/optimizations welcome!
AppleScript (GitHubGist):
save as an app:
right click>show package contents, add the following to info.plist (this hides the app icon from dock, necessitating the use of Activity Monitor or terminal >
pkill -f 'Split Tunnel'
to quit the app, omit if you WANT a dock icon:create a new one-line
routeNOPASSWD
file (no extension) using the following code EXACTLY (this can prevent sudo access if done incorrectly, google visudo
for more info - this allows the sudo commands in the AppleScript to run WITHOUT a password prompt, omit if you WANT a password prompt when the routing table needs to be changed):copy this file to
/etc/sudoers.d
run the following commands in terminal (second command will prompt for password - this allows the
sudo route
commands in the AppleScript to run WITHOUT prompting for password, omit if a password prompt is desired when script is changing routing table)finally add the app to System Prefs > Users and Groups > login items
goofologygoofology2701 gold badge2 silver badges12 bronze badges
You should be able to ask the administrator of the router you are connecting to to set up a separate 'group' that does split tunneling and give you a PCF file that contains the group name and group password for that group.
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Vebjorn LjosaVebjorn Ljosa
Free Cisco Anyconnect Vpn Client Download
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I had the same issue and got this working thanks to @mehaase
After creating the
~/vpn.sh
as answered by @mehaase you can put this into a runnable application automator script using these steps:- Using Automator create a new Application
- Add 'Run an AppleScript' under Library > Utilities
- Enter:
do shell script 'sudo ~/vpn.sh' with administrator privileges
- Save
You may also need to run
chmod 700 ~/vpn.sh
from Terminal to give the script execute privileges.After connecting to the VPN you can simply run this application script. Enter your admin password and click ok - Done. :)
Dwight BrownDwight Brown
protected by Community♦Oct 2 '18 at 17:21
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