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Comment by chupasaurus | Hacker News Reader

FYI Debian Security Team recommends setting new sysctl value net.ipv4.tcp_min_snd_mss to 536, even though they (Debian) are preserving the default kernel value of 48 for compatibility.

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Thats cool. In CentOS the default is 256. The settings are a little different though.

    net.ipv4.route.min_adv_mss = 256
    net.ipv4.tcp_base_mss = 512
    net.ipv6.route.min_adv_mss = 1220

It's worth noting that lwIP, the network stack used by most microcontroller based IoT devices, has a very low MSS. It's configurable, but typically defaults to 512.

That's very interesting. I have only seen those defaults in some... "special" satellite links.

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