#dmesg
信息：
[1839688.658040] net_ratelimit: 305 callbacks suppressed
[1839688.658060] nf_conntrack: table full, dropping packet
[1839688.674631] nf_conntrack: table full, dropping packet
[1839688.791594] nf_conntrack: table full, dropping packet
[1839688.800447] nf_conntrack: table full, dropping packet
[1839688.800716] nf_conntrack: table full, dropping packet
[1839688.800854] nf_conntrack: table full, dropping packet
[1839688.803950] nf_conntrack: table full, dropping packet
[1839688.805959] nf_conntrack: table full, dropping packet
[1839688.807302] nf_conntrack: table full, dropping packet
[1839688.812690] nf_conntrack: table full, dropping packet
解决方法：
sudo rmmod iptable_nat
sudo rmmod ip6table_nat
sudo rmmod nf_defrag_ipv4
sudo rmmod nf_defrag_ipv6
sudo rmmod nf_nat
sudo rmmod nf_nat_ipv4
sudo rmmod nf_nat_ipv6
sudo rmmod nf_conntrack
sudo rmmod nf_conntrack_ipv4
sudo rmmod nf_conntrack_ipv6
sudo rmmod xt_conntrack
sudo rmmod ip6table_nat
sudo rmmod nf_defrag_ipv4
sudo rmmod nf_defrag_ipv6
sudo rmmod nf_nat
sudo rmmod nf_nat_ipv4
sudo rmmod nf_nat_ipv6
sudo rmmod nf_conntrack
sudo rmmod nf_conntrack_ipv4
sudo rmmod nf_conntrack_ipv6
sudo rmmod xt_conntrack