configuration issues

Forums Network Management Linux and Networking configuration issues

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  • #42772

    Even with these changes the system is dropping some tcp connections randomly for no apparent reason. Plenty of memory available, and no errors passed to syslog or dmesg.

    IE: Tries connecting and then is unable to establish a connection. First 1-3 times.

    old kernel version appears to causes some issues:
    e1000 driver is buggy and csum doesnt work properly causing mostly tcp connections to fail

    performance improved with:
    ethtool -K ETH00 rx off
    ethtool -K ETH00 tx off

    System ran out of buffer space very fast, recommend the following changes to next release. Or maybe something more conservative.

    echo 65535 > /proc/sys/net/ipv4/neigh/default/gc_thresh1
    echo 65535 > /proc/sys/net/ipv4/neigh/default/gc_thresh2
    echo 65535 > /proc/sys/net/ipv4/neigh/default/gc_thresh3

    sysctl -w net.core.somaxconn=65535
    sysctl -w net.ipv4.tcp_syncookies=1
    sysctl -w net.ipv4.tcp_max_syn_backlog=65535

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