Ports needed to be opened

Posted on 2007-11-20
Last Modified: 2008-04-28
I am planning on deploying a SonicWall TZ150 to create an IPSec VPN and would like to know what ports need to be opened on a firewall to allow the VPN to connect. I am installing this solution on a Government facility and need to reqest the correct ports to be opened. I tried to install the device on the network last week and it would not connect. It would allow communication through port 80 but it looked like the problem was UPD port 500 but I want to make sure what ports I need to request to be opened.
Question by:tparus
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LVL 15

Expert Comment

ID: 20325514
you are using the tz150 as an endpoint?  If so, just check the box "enable VPN" and configure the vpn.

Or is there an endpoint behind the tz150?
LVL 19

Accepted Solution

SteveH_UK earned 500 total points
ID: 20326125
I don't know about the particular device you are using, but for IPsec VPNs to work you need the following:

IPsec generally needs UDP 500 for IKE (Internet Key Exchange).  You will also need AH (Authentication Header) and ESP (Encapsulated Security Payload) IP protocols to be allowed (51 and 50).  You may also need IPsec NAT-T which is UDP 4500.

Finally, it is often necessary to allow fragmented IP packets, as encrypted packets are often big.

LVL 19

Expert Comment

ID: 20821091
Thanks for the points :)

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