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add sit docs 

Signed-off-by: Marek Küthe <m.k@mk16.de>
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Marek Küthe 2023-01-02 17:31:25 +01:00
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docs/tunneling/index.md
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@ -3,3 +3,4 @@
- [fastd](fastd)
- [WireGuard](wireguard)
- [IP tunnel](iptunnel)

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docs/tunneling/gre.md → docs/tunneling/iptunnel.md
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# Generic Routing Encapsulation (GRE)
# IP tunnel
*Note:* GRE tunnels are unencrypted.
*Note:* IP tunnels (includes GRE, GRETAP and SIT) are unencrypted.
## Generic Routing Encapsulation (GRE)
GRE tunnels on layer 3 of the ISO/OSI model.
## Configuring with ip
### Configuring with ip
To create a tunnel, you can use the following command:
```
@ -32,7 +34,7 @@ ip addr add dev <interface> <ll>
```
Replace `<ll>` with your own link-local address.
### Automatic start with ifupdown
#### Automatic start with ifupdown
If you want to start the GRE tunnel automatically, you can use an ifupdown template which is placed under `/etc/network/interfaces.d`:
```
@ -54,3 +56,7 @@ ifdown <interface>
## GRETAP
GRETAP tunnels operate on layer 2 of the ISO/OSI model. To use a GRETAP tunnel, you only have to change the mode: For IPv4 `gretap` and for IPv6 `ip6gretap`.
## Simple Internet Transition (SIT)
SIT tunnels can be created in the same way as GRE tunnels. The difference is that you write `type sit` instead of `type gre`. SIT tunnels are designed to encapsulate IPv6 packets, so a SIT tunnel must be established over IPv4.