Hello.
Sorry to bother you guys but I'm stuck on this since days and I can't figure it out.
The short story: I've an old Rpi 1 running "LEDE Reboot 17.01" that I want to replace/upgrade by a Rpi 4.
So, I took the latest snapshot for the Rpi 4, installed everything necessary, configured it the same way as my old Pi, but I can't get my clients to connect to the Internet.
I've Internet on the Rpi4, my clients got well an IP and correct gateway/DNS, but they are unable to connect to the Internet, even by IP.
I compared settings from the old Pi and the new one, everything is the same and using OpenWRT since more than 4 years, I'm pretty familar with it but here I really don't see where can be the issue.
The setup is as follow:
LAN with IP 192.168.1.1 on eth1 (USB RTL8153 Gigabit Ethernet Adapter)
WAN with IP 192.168.2.8 on eth0 (built-in Pi Ethernet, connected to a 4G Router with IP 192.168.2.1)
And I have disabled the built-in wlan to avoid conflict.
/etc/config/network
config interface 'loopback'
option ifname 'lo'
option proto 'static'
option ipaddr '127.0.0.1'
option netmask '255.0.0.0'
config globals 'globals'
option ula_prefix 'fdc6:6381:045c::/48'
config interface 'lan'
option type 'bridge'
option proto 'static'
option netmask '255.255.255.0'
option ip6assign '60'
option ipaddr '192.168.1.1'
option gateway '192.168.2.1'
option ifname 'eth1'
list dns '1.1.1.1'
list dns '8.8.8.8'
config interface 'internet'
option proto 'static'
option delegate '0'
option ipaddr '192.168.2.8'
option netmask '255.255.255.0'
option gateway '192.168.2.1'
option ifname 'eth0'
list dns '1.1.1.1'
list dns '8.8.8.8'
/etc/config/firewall
config defaults
option syn_flood 1
option input ACCEPT
option output ACCEPT
option forward REJECT
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://dev.openwrt.org/ticket/10381
config rule
option name Allow-DHCPv6
option src wan
option proto udp
option src_ip fc00::/6
option dest_ip fc00::/6
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
/etc/config/dhcp
config dnsmasq
option domainneeded '1'
option boguspriv '1'
option filterwin2k '0'
option localise_queries '1'
option rebind_protection '1'
option rebind_localhost '1'
option local '/lan/'
option domain 'lan'
option expandhosts '1'
option nonegcache '0'
option authoritative '1'
option readethers '1'
option leasefile '/tmp/dhcp.leases'
option resolvfile '/tmp/resolv.conf.d/resolv.conf.auto'
option nonwildcard '1'
option localservice '1'
config dhcp 'lan'
option interface 'lan'
option start '100'
option limit '150'
option leasetime '2h'
option dhcpv6 'server'
option ra 'server'
option ra_slaac '1'
list ra_flags 'managed-config'
list ra_flags 'other-config'
option force '1'
list dhcp_option '37,65'
list dhcp_option '6,192.168.1.1'
list dhcp_option '3,192.168.1.1'
list dhcp_option '4,192.168.1.1'
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'
ip -4 route
default via 192.168.2.1 dev eth0
192.168.1.0/24 dev br-lan scope link src 192.168.1.1
192.168.2.0/24 dev eth0 scope link src 192.168.2.8
On the clients, gateway and DNS are well set to 192.168.1.1.
Any clue will be really welcome... 
Thank you.
