[ovs-discuss] What ports are to be opened on NAT to allow gre tunneling?
Ben Pfaff
blp at nicira.com
Fri May 30 15:15:48 UTC 2014
GRE runs over L3 (IP), not L4 (TCP/UDP/...), so there is no port to
open for it. Make sure your firewall passes GRE traffic. (I don't know
specifically how to configure that.)
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