Article ID: 181347 - View products that this article applies to.
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With filters on your Routing and Remote Access Service (RRAS) server configured to allow your network to ping remote hosts and to disallow the remote hosts from pinging your RRAS server or internal network hosts, you may notice that ping does not work in either direction.
When setting the input ICMP filter, the ICMP type and ICMP code fields are blank. This causes the default type and code value of 255 to be used. When 255 is used, all ICMP packets will be blocked (not received), including type 0, which is Echo Reply. When your computer tries to ping a host, the host replies with an Echo Reply ICMP packet, but because of the filter, the packet is discarded.
To resolve this issue set up the filters using the following steps:
TITLE : Internet Control Message Protocol (ICMP) Basics