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README.md
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@ -225,15 +225,15 @@ RUST_LOG=info /usr/local/bin/phantun_client --local 127.0.0.1:1234 --remote exam
Phantun aims to keep tunneling overhead to the minimum. The overhead compared to a plain UDP packet
is the following:
Standard UDP packet: 20 byte IP header + 8 byte UDP header = 28 bytes
**Standard UDP packet:** `20 byte IP header + 8 byte UDP header = 28 bytes`
Phantun obfuscated UDP packet: 20 byte IP header + 20 byte TCP header = 40 bytes
**Obfuscated packet:** `20 byte IP header + 20 byte TCP header = 40 bytes`
Note that Phantun does not add any additional header other than IP and TCP headers in order to pass through
stateful packet inspection!
Phantun's additional overhead: 12 bytes. I other words, when using Phantun, the usable payload for
Phantun's additional overhead: `12 bytes`. I other words, when using Phantun, the usable payload for
UDP packet is reduced by 12 bytes. This is the minimum overhead possible when doing such kind
of obfuscation.
@ -246,14 +246,20 @@ of obfuscation.
For people who use Phantun to tunnel [WireGuard®](https://www.wireguard.com) UDP packets, here are some guidelines on figuring
out the correct MTU to use for your WireGuard interface.
```
WireGuard MTU = Interface MTU - IP header (20 bytes) - TCP header (20 bytes) - WireGuard overhead (32 bytes)
```
For example, for a Ethernet interface with 1500 bytes MTU, the WireGuard interface MTU should be set as:
```
1500 - 20 - 20 - 32 = 1428 bytes
```
The resulted Phantun TCP data packet will be 1500 bytes which does not exceed the
interface MTU of 1500.
interface MTU of 1500. Please note it is strongly recommended to use the same interface
MTU for both ends of a WireGuard tunnel, or unexected packet loss may occur and these issues are
generally very hard to troubleshoot.
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