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Buffering Unix-domain socket

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unixbufferingsockdgram
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  • J
    JonathanLee
    last edited by Jan 13, 2025, 7:21 PM

    Hello fellow Netgate open-source Community members can you please help?
    Does changing this setting in SystemAdvancedSystem Tunables cause any issues? Are there any problems with doing this from a cybersecurity perspective?

    net.local.dgram.recvspace: 262144
    net.local.dgram.maxdgram: 16384
    

    As quited on Freebsd's website
    "The Unix-domain sockets of type SOCK_DGRAM are unreliable and always
    non-blocking for write operations. The default receive buffer can be
    configured with net.local.dgram.recvspace. The maximum allowed data-
    gram size is limited by net.local.dgram.maxdgram. A SOCK_DGRAM socket
    that has been bound with bind(2) can have multiple peers connected at
    the same time. The modern FreeBSD implementation will allocate
    net.local.dgram.recvspace sized private buffers in the receive buffer
    of the bound socket for every connected socket, preventing a situation
    when a single writer can exhaust all of buffer space. Messages coming
    from unconnected sends using sendto(2) land on the shared buffer of the
    receiving socket, which has the same size limit. A side effect of the
    implementation is that it doesn't guarantee that writes from different
    senders will arrive at the receiver in the same chronological order
    they were sent. The order is preserved for writes coming through a
    particular connection."

    Ref:
    https://man.freebsd.org/cgi/man.cgi?query=unix&sektion=4

    Make sure to upvote

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