- <column name="options" key="pmtud" type='{"type": "boolean"}'>
- Optional. Enable tunnel path MTU discovery. If enabled ``ICMP
- Destination Unreachable - Fragmentation Needed'' messages will be
- generated for IPv4 packets with the DF bit set and IPv6 packets above
- the minimum MTU if the packet size exceeds the path MTU minus the size
- of the tunnel headers. Note that this option causes behavior that is
- typically reserved for routers and therefore is not entirely in
- compliance with the IEEE 802.1D specification for bridges. Default is
- enabled; set to <code>false</code> to disable.
- </column>
-
- <group title="Tunnel Options: gre only">
- <p>
- Only <code>gre</code> interfaces support these options.
- </p>
-
- <column name="options" key="header_cache" type='{"type": "boolean"}'>
- Enable caching of tunnel headers and the output path. This can lead
- to a significant performance increase without changing behavior. In
- general it should not be necessary to adjust this setting. However,
- the caching can bypass certain components of the IP stack (such as
- <code>iptables</code>) and it may be useful to disable it if these
- features are required or as a debugging measure. Default is enabled,
- set to <code>false</code> to disable.
- </column>
- </group>
-