Hi all,
I have a question that I'm a bit embarassed to ask.
We have users in our office that need access to a remote network that has a
compatible systems (now Cisco) VPN switch. I was told that in order to
allow this
through our firewall, I had to open up ports TCP 500 and GRE47. My question
concerns GRE. Is GRE a protocol like TCP/UDP/ICMP? Or is it a subset of
TCP?
In trying to configure my firewall (secure computing) I only see options for
TCP and UDP ports when trying to map a port.
Also, I believe I read in one of Cisco's tech bulletins that your Cisco
router must be running a certain version of the IOS in order for this to
work. WHY???
Can someone please explain to me, in simple terms <grin> what exactly GRE
is?
Thanks in advance for your help!
-
[To unsubscribe, send mail to [EMAIL PROTECTED] with
"unsubscribe firewalls" in the body of the message.]
