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For questions about Transmission Control Protocol (TCP), a transport protocol used to encapsulate data across a network for reliable communication.

3
votes
Usually this includes “permit tcp any any established” plus specific UDP return traffic permits. … This eliminates the need for the return “permit tcp any any established” and “permit udp any eq 53 any” rules which can be exploited. …
answered Nov 16 '19 by Darrell Root
1
vote
It looks like whatever command you are using to capture the packets on the router is indeed capturing each packet twice. Given the time difference between the two captures, it looks like it is capturi …
answered Nov 11 '19 by Darrell Root
3
votes
“Protocol” has a very precise meaning to network engineers because that’s a specific field in the TCP/IP network stack. … Usually, the destination port in the direction the socket was initiated, in combination with the IP protocol (tcp or udp), determines how the data is interpreted (there are 256 protocol numbers, tcp and …
answered Nov 20 '19 by Darrell Root