Problem first occurred with a TP-Link Archer AX23 v1. I thought perhaps it had something to do with the hardware, so I replaced it with a TP-Link Archer C6 v3, but it had same problem.
After reboot it seems to run for about 24 hours, give or take, then suddenly the gateway router hangs. When I am able to watch the log, it appears to be full of lines like these:
[ 28.334531] mt7530-mdio mdio-bus:1f wan: Link is Up - 1Gbps/Full - flow control off
[ 28.901244] br-lan: port 6(phy1-ap0) entered blocking state
[ 28.906891] br-lan: port 6(phy1-ap0) entered forwarding state
[ 60.553756] nf_conntrack: nf_conntrack: table full, dropping packet
[ 60.560298] nf_conntrack: nf_conntrack: table full, dropping packet
[ 60.566668] nf_conntrack: nf_conntrack: table full, dropping packet
[ 60.572957] nf_conntrack: nf_conntrack: table full, dropping packet
[ 60.579288] nf_conntrack: nf_conntrack: table full, dropping packet
[ 60.585804] nf_conntrack: nf_conntrack: table full, dropping packet
[ 60.592178] nf_conntrack: nf_conntrack: table full, dropping packet
[ 60.598560] nf_conntrack: nf_conntrack: table full, dropping packet
[ 60.604830] nf_conntrack: nf_conntrack: table full, dropping packet
[ 60.611415] nf_conntrack: nf_conntrack: table full, dropping packet
[ 65.825287] net_ratelimit: 131 callbacks suppressed
[ 65.825320] nf_conntrack: nf_conntrack: table full, dropping packet
I have two AX23 and one C6. One is used as wan gateway, the other two configured as "dumb" access points, as per https://openwrt.org/docs/guide-user/network/wifi/wifiextenders/bridgedap
root@OpenWrt:~# ubus call system board
{
"kernel": "6.6.73",
"hostname": "OpenWrt",
"system": "MediaTek MT7621 ver:1 eco:3",
"model": "TP-Link Archer C6 v3",
"board_name": "tplink,archer-c6-v3",
"rootfs_type": "squashfs",
"release": {
"distribution": "OpenWrt",
"version": "24.10.0",
"revision": "r28427-6df0e3d02a",
"target": "ramips/mt7621",
"description": "OpenWrt 24.10.0 r28427-6df0e3d02a",
"builddate": "1738624177"
}
}
root@OpenWrt:~# cat /etc/config/network
config interface 'loopback'
option device 'lo'
option proto 'static'
option ipaddr '127.0.0.1'
option netmask '255.0.0.0'
config globals 'globals'
option ula_prefix 'fd2f:187a:e7ed::/48'
option packet_steering '1'
config device
option name 'br-lan'
option type 'bridge'
list ports 'lan1'
list ports 'lan2'
list ports 'lan3'
list ports 'lan4'
config interface 'lan'
option device 'br-lan'
option proto 'static'
option ipaddr '192.168.10.1'
option netmask '255.255.255.0'
option ip6assign '60'
list dns '192.168.10.10'
config interface 'wan'
option device 'wan'
option proto 'dhcp'
config interface 'wan6'
option device 'wan'
option proto 'dhcpv6'
root@OpenWrt:~# cat /etc/config/dhcp
config dnsmasq
option domainneeded '1'
option localise_queries '1'
option rebind_protection '1'
option rebind_localhost '1'
option local '/lan/'
option domain 'lan'
option expandhosts '1'
option cachesize '1000'
option authoritative '1'
option readethers '1'
option leasefile '/tmp/dhcp.leases'
option resolvfile '/tmp/resolv.conf.d/resolv.conf.auto'
option localservice '1'
option ednspacket_max '1232'
config dhcp 'lan'
option interface 'lan'
option start '100'
option limit '150'
option leasetime '12h'
option dhcpv4 'server'
option dhcpv6 'server'
option ra 'server'
list ra_flags 'managed-config'
list ra_flags 'other-config'
config dhcp 'wan'
option interface 'wan'
option ignore '1'
config odhcpd 'odhcpd'
option maindhcp '0'
option leasefile '/tmp/hosts/odhcpd'
option leasetrigger '/usr/sbin/odhcpd-update'
option loglevel '4'
root@OpenWrt:~# cat /etc/config/firewall
config defaults
option syn_flood 1
option input REJECT
option output ACCEPT
option forward REJECT
# Uncomment this line to disable ipv6 rules
# option disable_ipv6 1
config zone
option name lan
list network 'lan'
option input ACCEPT
option output ACCEPT
option forward ACCEPT
config zone
option name wan
list network 'wan'
list network 'wan6'
option input REJECT
option output ACCEPT
option forward REJECT
option masq 1
option mtu_fix 1
config forwarding
option src lan
option dest wan
# We need to accept udp packets on port 68,
# see https://dev.openwrt.org/ticket/4108
config rule
option name Allow-DHCP-Renew
option src wan
option proto udp
option dest_port 68
option target ACCEPT
option family ipv4
# Allow IPv4 ping
config rule
option name Allow-Ping
option src wan
option proto icmp
option icmp_type echo-request
option family ipv4
option target ACCEPT
config rule
option name Allow-IGMP
option src wan
option proto igmp
option family ipv4
option target ACCEPT
# Allow DHCPv6 replies
# see https://github.com/openwrt/openwrt/issues/5066
config rule
option name Allow-DHCPv6
option src wan
option proto udp
option dest_port 546
option family ipv6
option target ACCEPT
config rule
option name Allow-MLD
option src wan
option proto icmp
option src_ip fe80::/10
list icmp_type '130/0'
list icmp_type '131/0'
list icmp_type '132/0'
list icmp_type '143/0'
option family ipv6
option target ACCEPT
# Allow essential incoming IPv6 ICMP traffic
config rule
option name Allow-ICMPv6-Input
option src wan
option proto icmp
list icmp_type echo-request
list icmp_type echo-reply
list icmp_type destination-unreachable
list icmp_type packet-too-big
list icmp_type time-exceeded
list icmp_type bad-header
list icmp_type unknown-header-type
list icmp_type router-solicitation
list icmp_type neighbour-solicitation
list icmp_type router-advertisement
list icmp_type neighbour-advertisement
option limit 1000/sec
option family ipv6
option target ACCEPT
# Allow essential forwarded IPv6 ICMP traffic
config rule
option name Allow-ICMPv6-Forward
option src wan
option dest *
option proto icmp
list icmp_type echo-request
list icmp_type echo-reply
list icmp_type destination-unreachable
list icmp_type packet-too-big
list icmp_type time-exceeded
list icmp_type bad-header
list icmp_type unknown-header-type
option limit 1000/sec
option family ipv6
option target ACCEPT
config rule
option name Allow-IPSec-ESP
option src wan
option dest lan
option proto esp
option target ACCEPT
config rule
option name Allow-ISAKMP
option src wan
option dest lan
option dest_port 500
option proto udp
option target ACCEPT
The wan connection is a FTTH-DHCP router from the provider, 1gb link up/down.
