ZyXEL Communications ZyXEL ZyAIR 100 - Manual (Page 252)

ZyWALL 10~100 Series Internet Security Gateway
16-14 Remote Management Screens
Table 16-7 Security
LABEL DESCRIPTION
Do not respond
to requests for
unauthorized
services
Select this option to prevent hackers from finding the ZyWALL by probing for unused
ports. If you select this option, the ZyWALL will not send ICMP response packets to
port request(s) for unused ports, thus leaving the unused ports and the ZyWALL
unseen.
If the firewall blocks a packet from the WAN, the ZyWALL sends a TCP reset packet.
Use the "sys firewall tcprst rst off" command in the command interpreter if you want to
stop the ZyWALL from sending TCP reset packets.
Apply Click Apply to save your customized settings and exit this screen.
Reset Click Reset to begin configuring this screen afresh.