A Telnet connection in Java

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A Telnet connection
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its promises about data integrity, so if we want to block Telnet connections, say, we only have to break one part of this fragile loop. The usual strategy is to filter all incoming connections which do not have their ACK bit set, using router filtering rules. This will prevent any new connections from being established with the 'outside'. We can, on the other hand, allow packets which come from inside the local network. This provides a simple router-level firewall protection. It is useful for stopping IP spoofing attempts. The UDP protocol does not have SYN,ACK bits, and so it is more difficult to filter. 9.8.2 Example Telnet Session
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Aside from the theory, it is helpful to see a real example. Although slightly cumbersome, it is very informative to see how the communication actually takes place. The first thing we see is how inefficient the Telnet protocol is, how passwords are transmitted in clear text over the network, and how fragmentation and retransmission of IP fragments is performed to guarantee transmission. Notice also how the sequence numbers are randomized. from% telnet to . domain, country Trying 192.0.2.238. . . Connected to to.domain.country Escape character is '" ] ' . SunOS 5.6 login: mark Password: SunOS Release 5.6 Version Generic [UNIX(R) System VRelease 4 . 0]
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[/etc/motd] to% echo hei to% exit Send Syn to establish connection, + random Seq from -> to ETHER Type=0800 (IP) , size = 58 bytes from-> to IP D=192.0.2.238 S= 192.0.2.10 LEN=44, ID=53498 from -> to TCP D=23 S=54657 Syn Seq=4095044366 Len=0 Win=8760 from -> to TELNET C port = 54657 Reply with Syn, Ack and Ack=pr ev Seq+1 to -> from ETHER Type=0800 (IP) , size = 60 bytes to -> from IP D=192.0.2.10 S=192.0.2.238 LEN=44, ID=43390 to-> from TCP D=54657 S=23 Syn Ack=4095044367 Seq=826419455 Len=0 Win=8760 to -> from TELNET R port=54657 Reply with Ack = prev Seq+1 from -> to ETHER Type=0800 (IP) , size = 54 bytes from-> to IP D=192.0.2.238 S=192 . 0. 2 .10 LEN=40 , ID=53499 from -> to TCP D=23 S=54657 Ack=826419456 Seq=4095044367 Len=0 Win=8760 from -> to TELNET C port=54657 (retrans) from -> to ETHER Type=0800 (IP) , size = 81 bytes from-> to IP 0=192.0.2.238 5=192.0.2.10 LEN=67, ID=53500 from -> to TCP 0=23 S=54657 Ack=826419456 Seq=4095044367 Len=27 Win=8760 from -> to TELNET C port=54657 Now send data: ack = seq + Len each time until Fin to -> from ETHER Type=0800 (IP) , size = 60 bytes to -> from IP 0=192. 0.2.10 5=192.0.2.238 LEN=40, ID=43391 to-> from TCP D=54657 S=23 Ack=4095044394 Seq=826419456 Len=0 Win=8760 to -> from TELNET R port = 54657 (retrans) to -> from ETHER Type=0800 (IP) , size = 69 bytes to-> from IP 0=192.0.2.10 5=192.0.2.238 LEN=55, 10=43396 to-> from TCP 0=54657 S=23 Ack=4095044394 Seq=826419456 Len=15 Win=8760 to-> from TELNETRport=54657 from -> to ETHER Type=0800 (IP) , size = 54 bytes from-> to IP 0=192.0.2.238 5 = 192.0.2.10 LEN=40, ID=53504
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from -> to TCP 0=23 5=54657 Ack=826419471 Seq=4095044394 Len=0 Win=8760 from -> to TELNET C port=54657 (retrans with different Len! = fragmentation, sameAck) from -> to ETHER Type=0800 (IP) , size = 66 bytes from-> to IP 0=192.0.2.238 5=192.0.2.10 LEN=52, ID=53505 from -> to TCP D=23 5=54657 Ack=826419471 Seq=4095044394 Len=12 Win=8760 from -> to TELNET C port=54657 to -> from ETHER Type=0800 (IP) , size = 69 bytes to -> from IP 0=192.0.2.10 5 = 192.0. 2.238 LEN=55, 10=43397 to -> from TCP 0=54657 5=23 Ack=4095044394 Seq=826419471 Len=15 Win=8760 to -> from TELNETRport=54657 from -> to ETHER Type=0800 (IP) , size = 54 bytes from -> to IP 0=192.0.2.238 5=192.0.2.10 LEN=40, ID=53506 from -> to TCP 0=23 5=54657 Ack=826419486 Seq=4095044406 Len=0 Win=8760 from -> to TELNET C port=54657 to -> from ETHER Type=0800 (IP) , size = 75 bytes to -> from IP 0=192.0.2.10 5=192 . 0. 2 . 238 LEN=61, 10=43398 to-> from TCP 0=54657 5=23 Ack=4095044406 Seq=826419486 Len=21 Win=8760 to-> from TELNETRport=54657 from -> to ETHER Type=0800 (IP) , size = 120 bytes from -> to IP 0=192.0.2.238 5 = 192.0.2.10 LEN=106, ID=53507 from -> to TCP 0=23 5=54657 Ack=826419507 Seq=4095044406 Len=66 Win=8760 from -> to TELNET C port=54657 \377\372\30\OVT100\377\360 \377\372#\0from (Transfers TERM variable - VTIOO) to -> from ETHER Type=0800 (IP) , size = 75 bytes to -> from IP 0=192.0.2.10 5=192.0.2.238 LEN=61, 10=43399 to-> from TCP 0=54657 5=23 Ack=4095044472 Seq=826419507 Len=21 Win=8760 to -> from TELNETRport=54657 from -> to ETHER Type=0800 (IP) , size = 54 bytes from -> to IP 0=192.0.2.238 5=192.0.2.10 LEN=40, ID=53508 from -> to TCP 0=23 5=54657 Ack=826419528 Seq=4095044472 Len=0 Win=8760 from -> to TELNET C port=54657
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