Test network setup

Range of tested devices 11 Netgear 10 D-Link 6 Linksys 3 Belkin 2 Buffalo, Asus 1 Zyxel, Webee, Unicom, Telewell, SMC, Netwjork, Jensen, Edimax, Apple, A-Link 45 devices total Only ethernet to ethernet devices (no ADSL or cable modems)‏

Tests & output “random” options  5 random bytes as payload  Option kinds 111 and 151 (just picked two). Source IP address and port as option payload  Again option kinds 111 and 151. All tested devices seem to pass unknown options unaltered in SYN, SYN-ACK, FIN, data and pure ACK TCP segments in both directions. Some boxes mangle some options, ie. MSS Most of the boxes pass even malformed options just fine, the “smart” ones tend to drop them.