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Accepted
Tiffany Walker
Asked: 2013-03-25 06:24:44 +0800 CST

nf_conntrack: table full, dropping packet

  • 772
Mar 24 03:29:26 kernel: [1557411.243821] TCP: time wait bucket table overflow (CT0)
Mar 24 03:29:26 kernel: [1557411.243828] TCP: time wait bucket table overflow (CT0)
Mar 24 03:29:26 kernel: [1557411.243998] TCP: time wait bucket table overflow (CT0)
Mar 24 03:29:26 kernel: [1557411.244877] TCP: time wait bucket table overflow (CT0)
: [1564292.095620] __ratelimit: 37822 callbacks suppressed
Mar 24 05:24:18 kernel: [1564292.095623] nf_conntrack: table full, dropping packet.
Mar 24 05:24:18 kernel: [1564292.095629] nf_conntrack: table full, dropping packet.
Mar 24 05:24:18 kernel: [1564292.095866] nf_conntrack: table full, dropping packet.
Mar 24 05:24:18 kernel: [1564292.096156] nf_conntrack: table full, dropping packet.
Mar 24 05:24:18 kernel: [1564292.096201] nf_conntrack: table full, dropping packet.
Mar 24 05:24:18 kernel: [1564292.096232] nf_conntrack: table full, dropping packet.
Mar 24 05:24:18  kernel: [1564292.096271] nf_conntrack: table full, dropping packet.
Mar 24 05:24:18 kernel: [1564292.096310] nf_conntrack: table full, dropping packet.
Mar 24 05:24:18 kernel: [1564292.096348] nf_conntrack: table full, dropping packet.
Mar 24 05:24:18 kernel: [1564292.096376] nf_conntrack: table full, dropping packet.

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sysctl -p
error: "net.ipv4.ip_conntrack_max" is an unknown key
error: "net.ipv4.netfilter.ip_conntrack_generic_timeout" is an unknown key
error: "net.ipv4.netfilter.ip_conntrack_icmp_timeout" is an unknown key
error: "net.ipv4.netfilter.ip_conntrack_udp_timeout_stream" is an unknown key
error: "net.ipv4.netfilter.ip_conntrack_udp_timeout" is an unknown key
error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_close" is an unknown key
error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_time_wait" is an unknown key
error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_last_ack" is an unknown key
error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_close_wait" is an unknown key
error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_fin_wait" is an unknown key
error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_established" is an unknown key
error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_syn_recv" is an unknown key
error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_syn_sent" is an unknown key
error: "net.ipv4.netfilter.ip_conntrack_max" is an unknown key
error: "net.ip_conntrack_max" is an unknown key

and

/sbin/lsmod | egrep 'ip_tables|conntrack'
xt_conntrack            3968  0
nf_conntrack_ftp       12929  1 nf_nat_ftp
nf_conntrack_ipv4       9946  55 iptable_nat,nf_nat
nf_defrag_ipv4          1531  1 nf_conntrack_ipv4
ip_tables              18151  3 iptable_filter,iptable_nat,iptable_mangle
nf_conntrack_ipv6       8732  24
nf_defrag_ipv6         12315  1 nf_conntrack_ipv6
nf_conntrack           80236  9 nf_nat_ftp,xt_conntrack,nf_conntrack_ftp,xt_connlimit,iptable_nat,nf_nat,nf_conntrack_ipv4,nf_conntrack_ipv6,xt_state
ipv6                  325405  35 ip6t_REJECT,nf_conntrack_ipv6,nf_defrag_ipv6

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kernel

2.6.32-379.22.1.lve1.2.13.el6.x86_64 #1 SMP Fri Mar 1 09:43:47 EST 2013 x86_64 x86_64 x86_64 GNU/Linux

So what do I need to do to fix the following errors?

linux

2 Answers

  1. On Ubuntu 16.04 bumping nf_conntrack_max with

    sysctl -w net.netfilter.nf_conntrack_max=1000000

    worked for me.

    • 3
  2. Best Answer

    You are going right way. In modern kernels this parameter is called "nf_conntrack_max". Check Guntis's link at pc-freak.net , it would be useful for you.

    • 2