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Proxy Protocol Verification

Any circuit level tunneling through a proxy server such as SOCKS or SSL, will allow most protocols to be passed through a standard proxy gateway. Whenever you see a statement like this, you should remember that it implies that the protocol is not actually understood but merely transparently transmits it. For instance, the popular tunneling…

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Some IP Routing Stuff

Conceptually IP routing is pretty straight forward, especially when you look at it from the hosts point of view.  If the destination is directly connected such as a direct link or on the same Ethernet network then the IP datagram is simply forwarded to it’s destination.  If it’s not connected then the host simply send…

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Defining an Internet Address

Absolutely every device that exists on the internet needs an IP address (some call it an internet address). There are no exceptions – every pc, laptop, phone, coffee machine or printer if it’s online and accessible it needs an IP address. Needless to say the internet facing ones have to be unique in order to…

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A Little Bit About IP Checksums

The role of checksums in IP headers is actually very important.  THey are used to make sure that data is not corrupted during it’s journey from the source address to the destination.  TCP/IP uses a specific algorithm to check the data which involves dividing the checksum data in separate 16 bit fields.  Every one of…

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