Access across dual subnets

jyc860923 · June 25, 2020, 1:16am

Sorry if this has been asked before, but I can't find a way to enable access between one interface (192.168.10.x) and another (192.168.1.x).

I followed this tutorial https://openwrt.org/docs/guide-user/network/wifi/guestwifi/guest-wlan-webinterface but since I wanted to let the two subnets access each other, I didn't follow the procedures to isolate the "guest" network, I tried allowing guest to lan in the firewall settings, as well as putting the "guest" network in the same "lan" firewall zone, neither allowed devices connected to guest network (192.168.10.x) to access the other subnet (192.168.1.x).

Please help me understand what I need to do to connect the two subnets, thank you very much.

trendy · June 25, 2020, 10:47am

Please 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; \
uci export network; uci export wireless; \
uci export dhcp; uci export firewall; \
head -n -0 /etc/firewall.user

jyc860923 · June 25, 2020, 11:52am

Hi Trendy, thanks for taking a look for me, here's the output

{
        "kernel": "4.14.180",
        "hostname": "OpenWrt",
        "system": "ARMv7 Processor rev 0 (v7l)",
        "model": "Netgear Nighthawk X4S R7800",
        "board_name": "netgear,r7800",
        "release": {
                "distribution": "OpenWrt",
                "version": "19.07-SNAPSHOT",
                "revision": "r11108-b515edb775",
                "target": "ipq806x/generic",
                "description": "OpenWrt 19.07-SNAPSHOT r11108-b515edb775"
        }
}
package 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 '1234:5678:abcd::/48'

config interface 'lan'
        option type 'bridge'
        option ifname 'eth1.1'
        option proto 'static'
        option netmask '255.255.255.0'
        option ip6assign '60'
        option ipaddr '192.168.1.10'

config interface 'wan'
        option ifname 'eth0.2'
        option proto 'pppoe'
        option password 'password'
        option ipv6 'auto'
        option username 'username'
        option pppd_options 'persist maxfail 0'

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'

config interface 'guest'
        option proto 'static'
        option netmask '255.255.255.0'
        option delegate '0'
        option force_link '0'
        option ipaddr '192.168.10.10'

package wireless

config wifi-device 'radio0'
        option type 'mac80211'
        option hwmode '11a'
        option path 'soc/1b500000.pci/pci0000:00/0000:00:00.0/0000:01:00.0'
        option htmode 'VHT80'
        option channel '149'
        option country 'US'

config wifi-device 'radio1'
        option type 'mac80211'
        option hwmode '11g'
        option path 'soc/1b700000.pci/pci0001:00/0001:00:00.0/0001:01:00.0'
        option country 'US'
        option htmode 'HT40'
        option channel '3'

config wifi-iface 'default_radio1'
        option device 'radio1'
        option network 'lan'
        option mode 'ap'
        option key 'password'
        option ssid 'ssid1'
        option encryption 'psk2'

config wifi-iface 'wifinet2'
        option ssid 'ssid2'
        option encryption 'psk2'
        option device 'radio0'
        option mode 'ap'
        option network 'lan'
        option key 'password'

config wifi-iface 'wifinet3'
        option ssid 'guest'
        option encryption 'psk2'
        option device 'radio0'
        option mode 'ap'
        option network 'guest'
        option key 'password'

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 cachesize '1000'
        option authoritative '1'
        option readethers '1'
        option leasefile '/tmp/dhcp.leases'
        option resolvfile '/tmp/resolv.conf.auto'
        option localservice '1'
        option confdir '/tmp/dnsmasq.d'

config dhcp 'lan'
        option interface 'lan'
        option start '100'
        option limit '150'
        option leasetime '12h'
        option dhcpv6 'server'
        option ra 'server'
        option ra_management '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'

config dhcp 'guest'
        option start '100'
        option leasetime '12h'
        option limit '150'
        option interface 'guest'
        list dhcp_option '3,192.168.10.10'
        list dhcp_option '6, 8.8.8.8'

package firewall

config defaults
        option syn_flood '1'
        option input 'ACCEPT'
        option output 'ACCEPT'
        option forward 'REJECT'
        option flow_offloading '1'

config zone
        option name 'lan'
        option input 'ACCEPT'
        option output 'ACCEPT'
        option forward 'ACCEPT'
        option network 'lan guest'

config zone
        option name 'wan'
        option input 'REJECT'
        option output 'ACCEPT'
        option forward 'REJECT'
        option masq '1'
        option mtu_fix '1'
        option network 'wan'

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 include
        option path '/etc/firewall.user'

config include 'miniupnpd'
        option type 'script'
        option path '/usr/share/miniupnpd/firewall.include'
        option family 'any'
        option reload '1'

config include 'bcp38'
        option type 'script'
        option path '/usr/lib/bcp38/run.sh'
        option family 'IPv4'
        option reload '1'


# 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.

trendy · June 25, 2020, 1:34pm

FYI the ULA prefix is as private as 192.168.X.Y addresses are, no need to redact it.

No need to define it, it is automatically assigned.

Other than that I don't see anything wrong in your configuration. Albeit not the right way, having lan and guest in the lan zone allows the traffic between two interfaces. So at least ping from a host in lan will go through to guest interface. What I suspect is firewall on the hosts, especially in Windows it is by default not allowing packets from other networks.

jyc860923 · June 25, 2020, 3:21pm

Hi Trendy, thanks for taking the time and confirming that this should've worked, after the troubleshooting I've found that it was something wrong on the target machine indeed (not the firewall though) so you've pointed me the right direction.

Oh and I should probably start redacting my ipv4 "prefix" too given such a noob I am, I'm taking your solution, thank you.

trendy · June 25, 2020, 3:33pm

The IPv4 is usually just a single public IP.

jyc860923 · June 25, 2020, 3:43pm

Yeah I know that was a bad joke

system · July 5, 2020, 3:43pm

This topic was automatically closed 10 days after the last reply. New replies are no longer allowed.