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Proton/docs/ICMP_ECHO.md
Rémi Bernon ccfad43c81 docs: Add some documentation for proper ICMP ECHO system config. 
System ping utility cannot be used in SLR container so we need to use
ICMP sockets.

CW-Bug-Id: #19340
2021-11-11 18:36:07 +02:00

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ICMP ECHO requests (ping)

Some games rely on ICMP ECHO requests to detect network connectivity, or to measure connection ping.

Proton supports sending ICMP ECHO requests using RAW sockets or DGRAM ICMP sockets, but the former requires elevated priviledges, and the latter may also be disabled by default.

DGRAM ICMP sockets can be enabled for a given set of user groups by running the following command, and will stay enabled until next reboot:

sudo sysctl -w net.ipv4.ping_group_range="<low> <high>"

Where (resp ) is lower bound (resp higher) of the user groups which will be allowed to create such sockets. It is possible to enable them for any group by using "0 4294967295".

In order for the configuration to be persistent, it is possible to add the following line to /etc/sysctl.conf (or a file in /etc/sysctl.d):

net.ipv4.ping_group_range="<low> <high>"