Default Gateway lost after little reconfig in iluci-web (netgear r7800)

Installing and Using OpenWrt
1

Hello together,

i just sysupgrade the newes openwrt 22.3 to my netgear-r7800 and all works fine. A few days later i looked in the log an there were spam messages from odhcp6c / ipv6. because i dont use ipv6 i deinstalled odhcp6c and clicked a little bit in the network config in the web luci interface.

I think i deactivated everything with ipv6 in LAN and WAN6 - I had to restart WAN6 ...

From that point i had no default gw to my internet provider so the clients and openwrt itselfs had no internet connection. after i added the default gw through ssh with "route add dfeault gw -ipfrommyprovidery-" it worked.

is there a possibility to have the default gw automatically set? because when i restart the deice default gw is lost aigain.
and is there a possibility to save the config in luci and return to an old config when i misconfigured something?

uci show network:

network.loopback=interface
network.loopback.device='lo'
network.loopback.proto='static'
network.loopback.ipaddr='127.0.0.1'
network.loopback.netmask='255.0.0.0'
network.globals=globals
network.globals.ula_prefix='fdd8:f828:163c::/48'
network.@device[0]=device
network.@device[0].name='br-lan'
network.@device[0].type='bridge'
network.@device[0].ports='eth1.1'
network.@device[0].ipv6='0'
network.lan=interface
network.lan.device='br-lan'
network.lan.proto='static'
network.lan.ipaddr='192.168.1.1'
network.lan.netmask='255.255.255.0'
network.lan.ip6assign='60'
network.wan=interface
network.wan.device='eth0.2'
network.wan.proto='pppoe'
network.wan.username='DSL0001XXXXXXXXXXXXXXXXXXXXX2.de'
network.wan.password='XXXXXXXX'
network.wan.ipv6='0'
network.wan6=interface
network.wan6.device='eth0.2'
network.wan6.proto='dhcp'
network.@switch[0]=switch
network.@switch[0].name='switch0'
network.@switch[0].reset='1'
network.@switch[0].enable_vlan='1'
network.@switch_vlan[0]=switch_vlan
network.@switch_vlan[0].device='switch0'
network.@switch_vlan[0].vlan='1'
network.@switch_vlan[0].ports='1 2 3 4 6t'
network.@switch_vlan[1]=switch_vlan
network.@switch_vlan[1].device='switch0'
network.@switch_vlan[1].vlan='2'
network.@switch_vlan[1].ports='5 0t'
network.@device[1]=device
network.@device[1].name='eth0'
network.@device[1].ipv6='0'
network.@device[2]=device
network.@device[2].name='wlan1'
network.@device[2].ipv6='0'
network.@device[3]=device
network.@device[3].name='eth0.2'
network.@device[3].type='8021q'
network.@device[3].ifname='eth0'
network.@device[3].vid='2'
network.@device[3].ipv6='0'
network.@device[4]=device
network.@device[4].name='eth1'
network.@device[4].ipv6='0'
network.@device[5]=device
network.@device[5].name='eth1.1'
network.@device[5].type='8021q'
network.@device[5].ifname='eth1'
network.@device[5].vid='1'
network.@device[5].ipv6='0'
network.@device[6]=device
network.@device[6].name='pppoe-wan'
network.@device[6].ipv6='0'
network.@device[7]=device
network.@device[7].name='wlan0'
network.@device[7].ipv6='0'

thanks

2

I found the misconiguration. In Luci i have three interfaces: lan/wan/wan6 with wan beeing my internet-connection (dsl). in every interface the checkbox "use default gw" in tab "advance settings" was set. i deactivated the checkbox in lan and wan6 .. now it works and it brings up the correct default gw.

3

Another mistake is that you have protocol dhcp for wan6 interface, when it should be dhcpv6. And wan6 device should be @wan not eth0.2.

4

thanks for your answer. but i dont want ipv6 - and dhcpv6 is something with ipv6? so wan6 is only for ipv6 - should i delete it?

5

If you don't need IPv6 it's better to delete it rather than having it misconfigured.

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