Siemens RX1500 User Manual page 272

Chapter 5
Setup and Configuration
Figure 251: System Control Form
1. Ignore ICMP ALL Check Box
Check Box
3. Configure the following parameter(s) as required:
NOTE
ICMP redirect messages are sent by routers to hosts to inform them when a better route is
available for a particular destination. However, before enabling ROX II to send ICMP messages,
be aware that ICMP redirects are simple to forge, allowing attackers to control the path by which
packets are forwarded, and are sometimes considered a security risk. Send ICMP redirect
messages only when appropriate.
Parameter
Ignore ICMP ALL
Ignore ICMP Broadcast
TCP Syn Cookies
Send ICMP Redirect
4. Click Commit to save the changes or click Revert All to abort. A confirmation dialog box appears. Click OK
to proceed.
5. Click Exit Transaction or continue making changes.
240
1
2
3
4
2. Ignore ICMP Broadcast Check Box
Description
Default: false
Ignores all ICMP echo requests sent to it.
Default: true
Ignores all ICMP ECHO and TIMESTAMP requests sent to it via broadcast/multicast.
Default: false
Sends out syncookies when the syn backlog queue of a socket overflows. This is to
prevent against the common 'SYN flood attack'.
Default: true
Sends the ICMP redirect.
3. TCP Syn Cookies Check Box
RUGGEDCOM ROX II
User Guide
4. Send ICMP Redirect
Configuring ICMP Control