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Packet Filters
ICMP (Internet Control Message Protocol) is necessary to test network connections and to test functionality of
your firewall.
ICMP-forwarding and ICMP-on-firewall always apply to all IP addresses ("Any"). When these are enabled, all
IPs can ping the firewall (ICMP-on-firewall) or the network behind it (ICMP-forwarding). Separate IP addresses
can then no longer be ruled out with packet filter rules. If the ICMP settings are disabled, separate IPs and
networks can be allowed to send ICMP packets through the firewall by using appropriate packet filter rules.
ICMP Forwarding
Check the ICMP Forward checkbox to enable the forwarding of ICMP packets through the MultiAccess into
the local network and all connected DMZs. In this way you select whether an ICMP packet should be
dropped or passed through to the local network and all connected
If ICMP forward is enabled, ICMP packets go through all connected networks. Another use of ICMP
forwarding is to allow ICMP packets to be forwarded to individual networks (set in Packet Filter > Rules).
For this, ICMP forward in Packet Filter > ICMP must be disabled.
The status is activated by clicking the Save button.
ICMP on Firewall
Check the ICMP on Ethernet 1 or Ethernet 2 checkbox to enable the direct sending and receiving of ICMP
packets by the MultiAccess.
The status is activated by clicking the Save button.
MultiAccess Communications Server MA30120 User Guide
> ICMP
Chapter 3 – Software
Packet Filters > ICMP
DMZs.
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