[easy] - smart MTU black hole detection

[rs232]

I suggest we add a new function under advanced/firewall. Let’s call this called:

Smart MTU black hole detection

when enabled these two /proc parameters are tweaked:

echo 1 > /proc/sys/net/ipv4/tcp_mtu_probing
echo 1024 > /proc/sys/net/ipv4/tcp_base_mss

for reference the default values are currently 0 and 512 respectively.

I have been using this for few months with no noticeable side effects. So I would recommend enabling this by default.

Ref: rfc4821

Ref: https://blog.cloudflare.com/path-mtu-discovery-in-practice/

[pedro]

GUI: Advanced: Firewall: add smart MTU black hole detection and enable it by default (resolves #193)

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