I would like to have Tunnel based (route based) vpn between Sonicwall with Public IP and cisco c800 with dynamic IP. In case of dynamic VPN, i learnt that vpn mode would be aggressive mode instead of main mode.

IP address is: Sonicwall WAN: LAN:

Cisco WAN: Gateway: --> Cisco gets the IP from another WAN router. LAN:

This is how i have configured Sonicwall.

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What will be the steps to be followed in Cisco? Please help.

  • Did any answer help you? If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you can post and accept your own answer.
    – Ron Maupin
    Dec 16 '20 at 23:06

I've included a link for you to use. How Do I Configure A Route Based VPN Between SonicWall And Cisco?

  • the problem i could not configure it the way you mentioned is that Cisco doesn't have Public IP address. It is the private address that we are using in cisco. As i have mentioned above, cisco get the IP address from another router from another ISP.
    – de.walkar
    Jan 16 '20 at 8:23
  • If the Cisco device doesn't have a Public IP then either it will have to always initiate the VPN (look at Dynamic VPN) -- I don't know how well this will work with a Cisco to SonicWALL VPN though. OR you'll need to get IKE/AH/ESP opened up/forwarded/published to the Cisco [if possible] and use the WAN IP of the ISP -- and ensure NAT-Traversal is enabled. I would look into Dynamic Cisco to Static SonicWALL VPN, but even then you need to ensure NAT-T is working.
    – PSaul
    Jan 16 '20 at 15:43

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