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tuna2134
2026-06-30 00:43:24 +09:00
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README.md
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@@ -53,6 +53,18 @@ The transmit path permits local IPv6 fragmentation for encapsulated EtherIP
packets that exceed the outer path MTU. This lets a larger inner Ethernet
frame be split into multiple outer IPv6 fragments by the local host.
The device default MTU is 1500, but the module allows an overlay MTU up to
9000. For example, with a 1500-byte underlay and a 9000-byte overlay:
```sh
sudo ip link set eip0 mtu 9000
```
An inner 9000-byte payload is carried as a 9014-byte Ethernet frame, plus the
2-byte EtherIP header and 40-byte outer IPv6 header. The local IPv6 stack
fragments that outer packet before transmission, and the peer must reassemble
the IPv6 fragments before EtherIP decapsulation.
You can still set a smaller tunnel MTU when you want to avoid IPv6 fragments:
```sh