Using ip tunnel frame type filters – Allied Telesis AT-WL2411 User Manual
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AT-WL2411 Version 1.80 Installation and User’s Guide
103
Using IP Tunnel
Frame Type
Filters
The IP port automatically provides some filtering for end devices. You
can define permanent IP port filters to prevent unwanted frame
forwarding through an IP tunnel. IP ICMP packets with the following
types are forwarded:
❑ Echo Request
❑ Echo Reply
❑ Destination Unreachable
❑ Source Quench
❑ Redirect
❑ Alternate Host Address
❑ Time Exceeded
❑ Parameter Problem
❑ Time Stamp
❑ Time Stamp Reply
❑ Address Mask Request
❑ Address Mask Reply
❑ Trace Route
IP and ARP frames are never forwarded inbound through an IP tunnel to
the home subnet unless the source IP address belongs to the home
subnet. (Frames are only forwarded inbound if the source IP address in
the IP or ARP packet identifies an end device that has roamed away from
its home subnet.) IP and ARP frames are never forwarded outbound
through an IP tunnel by the root access point unless the destination IP
address belongs to the home subnet. (Frames are only forwarded
outbound to end devices that have roamed away from the home
subnet.) For detailed information about other frame types that are never
forwarded, see the list of frame types that are never forwarded in