_lsx
August 1, 2022, 9:51am
1
Hi
I'm using an R7800 configured as a router/access point on 21.02.3. Upstream of the R7800 is a Huawei 4G/5G modem/router that I've configured in bridge mode. The LAN port of the Huawei is connected to the R7800's WAN port and all my clients connect to the R7800.
On the R7800 I've set the WAN interface protocol as 'DHCP client' and the R7800 receives the IP details passed from the Huawei without a problem. The internet works just fine after a reboot often for days at a time.
However every so often the IP address assigned to the Huawei by the network provider changes, but the R7800 doesn't pick this up causing the internet connection for clients to stop working. At the moment the very technical way of resolving this is to reboot the R7800.
Unfortunately I don't know how I can get access to the current IP details the Huawei is connected to the network with from the R7800. My thoughts are that this information might not be accessible to the R7800 outside of a DHCP request made to/from the Huawei.
Any ideas?
trendy
August 1, 2022, 10:13am
2
Use ssh to connect to the device.
Please run the following commands (copy-paste the whole block) and paste the output here, using the "Preformatted text </> " button:
ubus call system board; \
uci export network; \
uci export dhcp; uci export firewall; \
head -n -0 /etc/firewall.user; \
ip -4 addr ; ip -4 ro li tab all ; ip -4 ru; \
ls -l /etc/resolv.* /tmp/resolv.* /tmp/resolv.*/* ; head -n -0 /etc/resolv.* /tmp/resolv.* /tmp/resolv.*/*
_lsx
August 1, 2022, 11:06am
3
{
"kernel": "5.4.188",
"hostname": "OpenWRT",
"system": "ARMv7 Processor rev 0 (v7l)",
"model": "Netgear Nighthawk X4S R7800",
"board_name": "netgear,r7800",
"release": {
"distribution": "OpenWrt",
"version": "21.02.3",
"revision": "r16554-1d4dea6d4f",
"target": "ipq806x/generic",
"description": "OpenWrt 21.02.3 r16554-1d4dea6d4f"
}
}
package 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 'XXXX:XXXX:XXXX::/48'
config device
option name 'br-lan'
option type 'bridge'
list ports 'eth1.1'
list ports 'usb0'
config interface 'lan'
option device 'br-lan'
option proto 'static'
option ipaddr '192.168.1.1'
option netmask '255.255.255.0'
option ip6assign '60'
config interface 'wan'
option proto 'dhcp'
option device 'eth0.2'
config interface 'wan6'
option device 'eth0.2'
option proto 'dhcpv6'
config switch
option name 'switch0'
option reset '1'
option enable_vlan '1'
config switch_vlan
option device 'switch0'
option vlan '1'
option ports '1 2 3 4 6t'
config switch_vlan
option device 'switch0'
option vlan '2'
option ports '5 0t'
package 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 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'
option ra_slaac '1'
list ra_flags 'managed-config'
list ra_flags 'other-config'
config dhcp 'wan'
option interface 'wan'
option ignore '1'
option start '100'
option limit '150'
option leasetime '12h'
list ra_flags 'none'
config odhcpd 'odhcpd'
option maindhcp '0'
option leasefile '/tmp/hosts/odhcpd'
option leasetrigger '/usr/sbin/odhcpd-update'
option loglevel '4'
package firewall
config defaults
option input 'ACCEPT'
option output 'ACCEPT'
option forward 'REJECT'
option synflood_protect '1'
config zone
option name 'lan'
option input 'ACCEPT'
option output 'ACCEPT'
option forward 'ACCEPT'
list network 'lan'
config zone
option name 'wan'
option input 'REJECT'
option output 'ACCEPT'
option forward 'REJECT'
option masq '1'
option mtu_fix '1'
list network 'wan'
list network 'wan6'
config forwarding
option src 'lan'
option dest 'wan'
config rule
option name 'Allow-DHCP-Renew'
option src 'wan'
option proto 'udp'
option dest_port '68'
option target 'ACCEPT'
option family 'ipv4'
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'
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'
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'
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'
config rule
option name 'Support-UDP-Traceroute'
option src 'wan'
option dest_port '33434:33689'
option proto 'udp'
option family 'ipv4'
option target 'REJECT'
option enabled 'false'
config include
option path '/etc/firewall.user'
# This file is interpreted as shell script.
# Put your custom iptables rules here, they will
# be executed with each firewall (re-)start.
# Internal uci firewall chains are flushed and recreated on reload, so
# put custom rules into the root chains e.g. INPUT or FORWARD or into the
# special user chains, e.g. input_wan_rule or postrouting_lan_rule.
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1000
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
7: br-lan: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP qlen 1000
inet 192.168.1.1/24 brd 192.168.1.255 scope global br-lan
valid_lft forever preferred_lft forever
9: eth0.2@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP qlen 1000
inet XXX.XX.XXX.XXX/16 brd XXX.XX.XXX.XXX scope global eth0.2
valid_lft forever preferred_lft forever
default via XXX.XX.X.X dev eth0.2 src XXX.XX.XXX.XXX
XXX.XX.X.X/16 dev eth0.2 scope link src XXX.XX.XXX.XXX
192.168.1.0/24 dev br-lan scope link src 192.168.1.1
broadcast 127.0.0.0 dev lo table local scope link src 127.0.0.1
local 127.0.0.0/8 dev lo table local scope host src 127.0.0.1
local 127.0.0.1 dev lo table local scope host src 127.0.0.1
broadcast 127.255.255.255 dev lo table local scope link src 127.0.0.1
broadcast XXX.XX.X.X dev eth0.2 table local scope link src XXX.XX.XXX.XXX
local XXX.XX.XXX.XXX dev eth0.2 table local scope host src XXX.XX.XXX.XXX
broadcast XXX.XX.XXX.XXX dev eth0.2 table local scope link src XXX.XX.XXX.XXX
broadcast 192.168.1.0 dev br-lan table local scope link src 192.168.1.1
local 192.168.1.1 dev br-lan table local scope host src 192.168.1.1
broadcast 192.168.1.255 dev br-lan table local scope link src 192.168.1.1
0: from all lookup local
32766: from all lookup main
32767: from all lookup default
lrwxrwxrwx 1 root root 16 Apr 16 13:59 /etc/resolv.conf -> /tmp/resolv.conf
-rw-r--r-- 1 root root 47 Jul 14 14:23 /tmp/resolv.conf
-rw-r--r-- 1 root root 127 Aug 1 10:00 /tmp/resolv.conf.d/resolv.conf.auto
/tmp/resolv.conf.d:
-rw-r--r-- 1 root root 127 Aug 1 10:00 resolv.conf.auto
==> /etc/resolv.conf <==
search lan
nameserver 127.0.0.1
nameserver ::1
==> /tmp/resolv.conf <==
search lan
nameserver 127.0.0.1
nameserver ::1
==> /tmp/resolv.conf.d <==
head: /tmp/resolv.conf.d: I/O error
==> /tmp/resolv.conf.d/resolv.conf.auto <==
# Interface wan
nameserver XXX.XXX.XXX.X
nameserver XXX.XXX.XXX.X
# Interface wan6
nameserver XXXX::XXXX:XXXX:XXXX:XXXX%eth0.2
trendy
August 1, 2022, 11:16am
4
The 7800 has acquired its own address on the wan interface from your ISP. If the Huawei modem gets an IP as well, it is not possible for the 7800 to detect that. A couple of workarounds are to use watchcat package and restart the interface automatically after a period of internet inactivity. Or write your own script to query the Huawei for its IP and restart the wan interface whenever it changes.
_lsx
August 1, 2022, 11:41am
5
Wow thanks for looking at this
I'll go with watchcat just because that's the easier option.
I owe you a beer!
1 Like
trendy
August 1, 2022, 11:43am
6
If your problem is solved, please consider marking this topic as [Solved]. See How to mark a topic as [Solved] for a short how-to.
as I remember, just for your reference, maybe I'm wrong:
Huawei router: static IP 192.168.0.1, WAN port DHCP
then you no need to care the real WAN ports IP by DHCP changed to the others.
tmomas
August 11, 2022, 12:41pm
8
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