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Special Forums IP Networking Facing issue in ip6table rule for port based routing management Post 302770383 by DGPickett on Friday 15th of February 2013 01:30:36 PM
Old 02-15-2013
There are many reasons fragmentation is not preferred, and here is another. Since packet fragmentation is an IP level function, the udp or tcp header is just payload, and it is only in the first fragment.

I suppose you could write a stateful version of the ip*table that caches the udp/tcp header and the routing or discard decision it received for fragmented packets. But it is possible for fragements to get out of order, so the first fragment might not arrive first.

A proxy firewall like socks would assemble packets before deciding to forward them or discard them, and if forwarded, they would be re-fragmented.
 

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services(4)						     Kernel Interfaces Manual						       services(4)

NAME
services - Defines the sockets and protocols used for Internet services SYNOPSIS
/etc/services DESCRIPTION
The /etc/services file associates Internet service names and aliases with the port number and protocol used by the service. Each service is listed in this file on a single line of the form: ServiceName PortNumber/ProtocolName Aliases The fields contain the following information: The official Internet service name. The socket port number used for the service and the transport protocol used for the service. A list of unofficial service names. Items on a line are separated by spaces or tabs. Comments begin with a # (number sign) and continue to the end of the line. EXAMPLES
Entries in the /etc/services file for the inetd internal services might look like this: echo 7/tcp echo 7/udp discard 9/tcp sink null discard 9/udp sink null daytime 13/tcp daytime 13/udp chargen 19/tcp ttytst source chargen 19/tcp ttytst source ftp 21/tcp time 37/tcp timeserver time 37/udp timeserver RELATED INFORMATION
Functions: endservent(3), getservbyname(3), getservbyport(3), getservent(3), setservent(3) The RFC923 specification. delim off services(4)
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