Router is messed up, help is appreciated

Installing and Using OpenWrt
1

I had a working OpenWrt setup for 2 years with no issues but suddenly one night it stopped working and couldn't figure out what happened, so I posted here and got some suggestions about my PiHole messing up and change DNS to public ones and it was working after that for couple of weeks and stopped again yesterday night when the Xfinity modem restarted after which I am unable to fix it. So, I went ahead and reset the whole thing and installed a fresh latest firmware to setup from scratch but I am having so many weird things happen.

  • After first boot, LAN interface still shows the old Pihole DNS server even without me setting up anything
  • Ping test returns 100% packet loss
  • One time package update worked but stopped after that
  • Connected to the router through LAN cable but still can't get internet to work on the client laptop
  • Basic setup of WiFi radios and connecting to them also not giving any internet

Added 1.1.1.1, 4.4.4.4 at Network > DHCP and DNS > Forwarders but still no internet

Screenshot 2024-11-01 164624

root@OpenWrt:~# ubus call system board
{
        "kernel": "5.15.167",
        "hostname": "OpenWrt",
        "system": "ARMv8 Processor rev 4",
        "model": "Linksys E8450 (UBI)",
        "board_name": "linksys,e8450-ubi",
        "rootfs_type": "squashfs",
        "release": {
                "distribution": "OpenWrt",
                "version": "23.05.5",
                "revision": "r24106-10cc5fcd00",
                "target": "mediatek/mt7622",
                "description": "OpenWrt 23.05.5 r24106-10cc5fcd00"
        }
}

root@OpenWrt:~# cat /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 cachesize '1000'
        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'
        option ednspacket_max '1232'
        option filter_aaaa '0'
        option filter_a '0'

config dhcp 'lan'
        option interface 'lan'
        option start '100'
        option limit '150'
        option leasetime '12h'
        option dhcpv4 'server'
        option dhcpv6 'server'
        option ra 'server'
        option ra_slaac '1'
        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:~# nslookup google.com 192.168.1.217
;; connection timed out; no servers could be reached

root@OpenWrt:~# nslookup google.com
Server:         127.0.0.1
Address:        127.0.0.1:53

Non-authoritative answer:
Name:   google.com
Address: 2607:f8b0:4009:801::200e

Non-authoritative answer:
Name:   google.com
Address: 172.217.1.110
2

This will scrap everything but run firstboot -y && reboot to scrub old configs.

and I'm going to add, as a pi-hole user, I doubt the pi has anything to do with this.

3

run firstboot -y && reboot through SSH? if so, it rebooted to first boot without password but has same issues as before

with PiHole messing up, I meant DNS routing messed up

4

While you didn't share your network config, I'm going to guess that the problem is that you've got the same subnet defined on the upstream (wan) as the lan. If both interfaces have the same or overlapping subnets, routing will break.

You need to change one or the other.

Ideally you can remove the upstream router entirely, but if it is a combo modem+router, you'll need to see if you can set the device into bridge mode (disabling its onboard routing + wifi) so that it passes your ISP issued IP address to the wan of your OpenWrt router.

If that's not possible, the next best option is to change the IP address of the OpenWrt lan. I'd recommend an address like 192.168.5.1.

https://openwrt.org/faq/change_lan_ip

5

Anyway you can.

SSH is fine.
It will scrub everything. This is the first time I've seen something, other than a RPi, fail to completely clear settings after a fresh install but the result looks the same: something from the last config persisted.

6

I'm rusty...

@chowdarygm

Please connect to your OpenWrt device using ssh and copy the output of the following commands and post it here using the "Preformatted text </> " button:

Remember to redact passwords, MAC addresses and any public IP addresses you may have:

ubus call system board
cat /etc/config/network
cat /etc/config/wireless
cat /etc/config/dhcp
cat /etc/config/firewall
7

You are right on the subnet part as my AT&T router is set to 192.168.1.1 and I need it to make some other devices connected directly to AT&T router to work and have the AT&T WiFi as backup. So, I have always used the last option you mentioned and have the OpenWrt router's IP set to 192.168.2.1 and did the same after current reset also but but that didn't help much

8

ok... then let's see the complete configuration as requested by @LilRedDog above.

9

here it is

{
        "kernel": "5.15.167",
        "hostname": "OpenWrt",
        "system": "ARMv8 Processor rev 4",
        "model": "Linksys E8450 (UBI)",
        "board_name": "linksys,e8450-ubi",
        "rootfs_type": "squashfs",
        "release": {
                "distribution": "OpenWrt",
                "version": "23.05.5",
                "revision": "r24106-10cc5fcd00",
                "target": "mediatek/mt7622",
                "description": "OpenWrt 23.05.5 r24106-10cc5fcd00"
        }
}
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 'XXX::/48'

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 '192.168.2.1'
        option netmask '255.255.255.0'
        option ip6assign '60'

config interface 'wan'
        option device 'wan'
        option proto 'dhcp'

config interface 'wan6'
        option device 'wan'
        option proto 'dhcpv6'

root@OpenWrt:~# cat /etc/config/wireless

config wifi-device 'radio0'
        option type 'mac80211'
        option path 'platform/18000000.wmac'
        option channel '1'
        option band '2g'
        option htmode 'HT20'
        option disabled '1'

config wifi-iface 'default_radio0'
        option device 'radio0'
        option network 'lan'
        option mode 'ap'
        option ssid 'OpenWrt'
        option encryption 'none'

config wifi-device 'radio1'
        option type 'mac80211'
        option path '1a143000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0'
        option channel '36'
        option band '5g'
        option htmode 'HE80'
        option disabled '1'

config wifi-iface 'default_radio1'
        option device 'radio1'
        option network 'lan'
        option mode 'ap'
        option ssid 'OpenWrt'
        option encryption 'none'

root@OpenWrt:~# cat /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 cachesize '1000'
        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'
        option ednspacket_max '1232'
        option filter_aaaa '0'
        option filter_a '0'

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'
10

posted above

11

That is the second one of those today to flake out after running just fine... :face_with_raised_eyebrow: :face_with_monocle:

12

Can you post the firewall file, too?

13

ya, surprisingly I had two them work in wifi roaming setup and both are having same issue same day

14

Sorry, I thought I included it. Here it is

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


### EXAMPLE CONFIG SECTIONS
# do not allow a specific ip to access wan
#config rule
#       option src              lan
#       option src_ip   192.168.45.2
#       option dest             wan
#       option proto    tcp
#       option target   REJECT

# block a specific mac on wan
#config rule
#       option dest             wan
#       option src_mac  00:11:22:33:44:66
#       option target   REJECT

# block incoming ICMP traffic on a zone
#config rule
#       option src              lan
#       option proto    ICMP
#       option target   DROP

# port redirect port coming in on wan to lan
#config redirect
#       option src                      wan
#       option src_dport        80
#       option dest                     lan
#       option dest_ip          192.168.16.235
#       option dest_port        80
#       option proto            tcp

# port redirect of remapped ssh port (22001) on wan
#config redirect
#       option src              wan
#       option src_dport        22001
#       option dest             lan
#       option dest_port        22
#       option proto            tcp

### FULL CONFIG SECTIONS
#config rule
#       option src              lan
#       option src_ip   192.168.45.2
#       option src_mac  00:11:22:33:44:55
#       option src_port 80
#       option dest             wan
#       option dest_ip  194.25.2.129
#       option dest_port        120
#       option proto    tcp
#       option target   REJECT

#config redirect
#       option src              lan
#       option src_ip   192.168.45.2
#       option src_mac  00:11:22:33:44:55
#       option src_port         1024
#       option src_dport        80
#       option dest_ip  194.25.2.129
#       option dest_port        120
#       option proto    tcp
15

Firewall looks fine.

Can you please show us the system topology diagram (complete with addresses). A simple photo of a pen-and-paper drawing is totally fine here.

1 Like
16

Actually, as I look at the firewall file, there are some oddities:

for example:

Notice how the network is enclosed in a set of single quotes ('), but the other lines do not have that.

Can you check the file itself again and see if this is just an issue of how it was copied into the forum, or if the quotes are missing?

18

Here it is

image
image725×602 40.6 KB

19

I just copied the output of SSH command, if I have to check the file, where should I check it?

20

25 beginner Linux commands.

But if that was a direct copy and paste you answered him.

1 Like
21

To be clear, the connection between the Xfinity router and the OpenWrt router is LAN > WAN, right? And please confirm that the intent is for the "personal devices" to exist on a separate network relative to the NAS and pihole and such... is that correct?

look at the terminal output that you get when you enter:

cat /etc/config/firewall

Then look at the output, specifically in the lan section that I called out. Do all of the lines have ' single quotes for the last value, or is it only as I pointed out in the above post?