From: casedj@21cn.com   
      
   Thank you.   
      
   You are right. ESP uses UDP port 500.   
      
   Rds   
   Case   
      
   David Efflandt wrote:   
   > On Tue, 03 Feb 2004 15:34:19 +0800, case  wrote:   
   >   
   >>The ESP destination IP port number is 50, this port is UDP or TCP?   
   >>or both of them?   
   >   
   >   
   > I believe the answer is "none of the above".  If you are trying to use   
   > ipsec the answer is "protocol" 50 (not a port).  So if you need to forward   
   > or not block it, you need something capable of recognizing or forwarding   
   > protocols (like Linux iptables).   
   >   
   > However, ipsec also needs UDP port 500.   
   >   
   > I have not used a hardware router that does VPN passthrough, so I am not   
   > sure how those are configured.   
   >   
      
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