Czasem zdarza się, że net przestaje działać, a w logach komunikat 'ip_conntrack: table full, dropping packet'. Wtedy przydaje się to:

echo "2400" > /proc/sys/net/ipv4/tcp_keepalive_time
echo "30" > /proc/sys/net/ipv4/tcp_fin_timeout
echo "60" > /proc/sys/net/ipv4/netfilter/ip_conntrack_generic_timeout
echo "20" > /proc/sys/net/ipv4/netfilter/ip_conntrack_icmp_timeout
echo "60" > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_close_wait
echo "1" > /proc/sys/net/ipv4/igmp_max_memberships
echo "0" > /proc/sys/net/ipv4/tcp_window_scaling
echo "0" > /proc/sys/net/ipv4/tcp_sack
echo "32768-64000" > /proc/sys/net/ipv4/ip_local_port_range
echo "43200" > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_established
echo "5" > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_close
echo "20" > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_fin_wait
echo "30" > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_last_ack
echo "20480" > /proc/sys/net/ipv4/ip_conntrack_max
echo "10240" > /proc/sys/net/ipv4/netfilter/ip_conntrack_max
echo "40" > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_time_wait
echo "30" > /proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout
echo "180" > /proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout_stream
echo "20" > /proc/sys/net/ipv4/ipfrag_time
echo "1280" > /proc/sys/net/ipv4/tcp_max_syn_backlog