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Using existing RSA keys on Cisco Anyconnect

Posted on 2017-09-21
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Medium Priority
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Last Modified: 2017-09-22
Hi All,

I'm installing the Cisco Anyconnect software to our ISR 4431 and it's asking me to setup RSA keys and self signed certificate but it's asking me to overwrite the existing one ? We have a site to site VPN setup that i think these keys were for so firstly if i DO overwrite the original one's then will this cause an issue with the site to site VPN or can i use the existing RSA keys etc with Anyconnect (and if so how)
Hope this makes sense.
Thanks
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Question by:gci_ee
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4 Comments
 
LVL 47

Expert Comment

by:Craig Beck
ID: 42304944
How is the VPN being authenticated?  If it's IPSec with a preshared-key it won't be using the RSA config on the router.
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Author Comment

by:gci_ee
ID: 42305217
Hi Craig,

We'll be using the Cisco Anyconnect client if that's what you mean ? I've not used it before so not sure at this stage with method it uses ?
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LVL 47

Expert Comment

by:Craig Beck
ID: 42305239
No I mean for your current site-to-site VPN.  How is it configured?

You can terminate Anyconnect VPNs via SSL on the router, while also terminating different types of VPN for site-to-site connectivity.
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Author Comment

by:gci_ee
ID: 42305875
aaah, right, sorry, i've not set the VPN up but i believe it's ipsec looking at the sh run:

crypto ipsec transform-set ESP-3DES-SHA1 esp-3des esp-sha-hmac
 mode tunnel
crypto ipsec transform-set NLSET esp-des esp-md5-hmac
 mode tunnel
!
crypto ipsec profile VTI
 set transform-set ESP-3DES-SHA1
!
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