Iptables Tutorial 1.2.2

tcp 6 57 SYN_RECV src=192.168.1.5 dst=192.168.1.35 sport=1031

dport=23 src=192.168.1.35 dst=192.168.1.5 sport=23 dport=1031

use=1

Now we have received a corresponding SYN/ACK in return. As soon as this packet has been received, the state changes once again, this time to SYN_RECV. SYN_RECV tells us that the original SYN was delivered correctly and that the SYN/ACK return packet also got through the firewall properly. Moreover, this co

tcp 6 431999 ESTABLISHED src=192.168.1.5 dst=192.168.1.35

sport=1031 dport=23 src=192.168.1.35 dst=192.168.1.5

sport=23 dport=1031 [ASSURED] use=1

In the last example, we have gotten the final ACK in the 3-way handshake and the co

A co

When a TCP co

As you can see, the co

When the TCP co

If the co

Table 7-2. Internal states