Why does UDP 500 need to be forwarded?

[David]

Archived from groups: comp.dcom.vpn (More info?)

Hi,

We're a small shop running a Sonicwall SOHO3 using the latest firmware. One
license for the global VPN client is installed.

At home I have a Linksys WRT54G, also running the latest firmware. In the
linksys I have to forward UDP port 500 to the IP of the portable. If I
don'tn the connection won't work. I don't even get a prompt for
username/password.

Why is this? I can imagine someone wanting to VPN in from say a hotel
somewhere. It would be unlikely the hotel would forward UDP port 500 to
someone's laptop during his/her stay. And even if they wanted to do this,
what if another person wants to VPN to somewhere else? You can't forward
port 500 twice, now can you?

someone here who can enlighten me?


thanks,

David

 

[David]

Archived from groups: comp.dcom.vpn (More info?)

Solved, it's a Linksys issue.

I tried the connection from another location, where I'm behind 2 firewalls
that don't have UDP 500 forwarded, and it worked perfectly.


> We're a small shop running a Sonicwall SOHO3 using the latest firmware.
> One license for the global VPN client is installed.
>
> At home I have a Linksys WRT54G, also running the latest firmware. In the
> linksys I have to forward UDP port 500 to the IP of the portable. If I
> don'tn the connection won't work. I don't even get a prompt for
> username/password.
>
> Why is this? I can imagine someone wanting to VPN in from say a hotel
> somewhere. It would be unlikely the hotel would forward UDP port 500 to
> someone's laptop during his/her stay. And even if they wanted to do this,
> what if another person wants to VPN to somewhere else? You can't forward
> port 500 twice, now can you?
>
> someone here who can enlighten me?
>
>
> thanks,
>
> David
>
>