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## optimal_mtu.md

      
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                nitred
                / optimal_mtu.md
            
            
              Last active
              May 1, 2024 15:22
            
              
                Wireguard Optimal MTU
              
          
    About


I faced bandwidth issues between a WG Peer and a WG server. Download bandwidth when downloading from WG Server to WG peer was reduced significantly and upload bandwidth was practically non existent.
I found a few reddit posts that said that we need to choose the right MTU. So I wrote a script to find an optimal MTU.
Ideally I would have liked to have run all possible MTU configurations for both WG Server and WG Peer but for simplicity I choose to fix the WG Server to the original 1420 MTU and tried all MTUs from 1280 to 1500 for the WG Peer.

Testing


On WG server, I started an iperf3 server
On WG peer, I wrote a script that does the following:

wg-quick down wg0


Edit MTU in the /etc/wireguard/wg0.conf file


## gist:8443477
from sqlalchemy import Column, Integer, create_engine
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()

# a model
class Thing(Base):
    __tablename__ = 'thing'

    id = Column(Integer, primary_key=True)

## command line
/usr/bin/cpp -P -undef -Wundef -std=c99 -nostdinc -Wtrigraphs -fdollars-in-identifiers -C < foo.js
	from sqlalchemy import Column, Integer, create_engine
	from sqlalchemy.ext.declarative import declarative_base
	Base = declarative_base()

	# a model
	class Thing(Base):
	__tablename__ = 'thing'

	id = Column(Integer, primary_key=True)