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Special Forums IP Networking Solaris 11 Express NAT/Router IP Fragments Post 302512761 by DGPickett on Monday 11th of April 2011 02:48:52 PM
Old 04-11-2011
Path MTU Discovery is nice on a varied intranet, but not so good for the Internet, where the short relationships might make it not worth the effort.

Use a sniffer to see what sort of options are in your standard TCP packets (not SYN or FIN). Add their length to the 40 before subtracting. Sometimes, the RWIN is called max MSS. Try various options with a long stream between two local hosts.

Normally, frags are for big UDP packets and normal-net-max packets on VPN.
 

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SNOOPY(8)						      System Manager's Manual							 SNOOPY(8)

NAME
snoopy - spy on Ethernet packets SYNOPSIS
snoopy [ -abceiltup9 ] [ -np ] [ -N count ] DESCRIPTION
Snoopy displays the header and first 20 data bytes of packets received from the local Ethernet. The packets displayed depend on the options chosen. The following options each select packets from a particular protocol. If more than one flag is given, packets from all those protocols are displayed. a ARP b BOOTP c ICMP e all Ethernet packets i IP l IL t TCP u UDP By default all addresses are translated into system names. The option n suppresses this. Snoopy runs in promiscuous mode by default, displaying all packets it can capture from the Ethernet. The option p causes only packets sent to or from the system snoopy is running on to be displayed. Option 9 causes the data of TCP and IL messages to be interpreted and displayed as 9P messages. The N option sets the count (default 20) of the number of bytes to dump in hexadecimal from each packet. FILES
/net/ether Ethernet device SOURCE
/sys/src/cmd/ip/snoopy.c BUGS
The CPU servers do not take well to running in promiscuous mode. If run on them, snoopy may kill their Ethernets. SNOOPY(8)
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