Using VLANs for network isolation while tagging VID for ISP?

bbbrad · August 3, 2024, 1:10am

[edited for clarity]
Hi! I'm setting up networks for home, guest, and iot with VLANs on an MT6000. I've followed everything in this post (VLAN on DL-WRX36). My router WAN connects directly to the service providers ONT box (ie, I am not using the router provided by the ISP), so my config has additional configuration for PPPoE login and VLAN tagging VID 201.

All seems to work as I expect but I'm hoping to confirm it's right and secure as I test adding the SSIDs.

Questions:

Is the way I did the PPPoE/VID section (WAN on 'eth1.201') correct and secure?
My ISP and devices have full IPv6 support but my brain does not, yet. Am I missing any improvements? Should WAN6 be on eth1.201 like WAN instead of just eth1?
My config used the example's allocation for ports 1-4 but I still have a 5th physical lan port open and unassigned. I assume that's fine left unused for now?

thanks!

ubus call system board:

{
"kernel": "6.6.32",
"hostname": "computer123",
"system": "ARMv8 Processor rev 4",
"model": "GL.iNet GL-MT6000",
"board_name": "glinet,gl-mt6000",
"rootfs_type": "squashfs",
"release": {
	"distribution": "OpenWrt",
	"version": "SNAPSHOT",
	"revision": "r26513-65f34e9928",
	"target": "mediatek/filogic",
	"description": "OpenWrt SNAPSHOT r26513-65f34e9928"
}
}

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 'fda2:edaf:407b::/48'

config device
	option name 'br-lan'
	option type 'bridge'
	list ports 'lan1'
	list ports 'lan2'
	list ports 'lan3'
	list ports 'lan4'
	list ports 'lan5'

config interface 'lan'
	option device 'br-lan.1'
	option proto 'static'
	option ipaddr '192.168.1.1'
	option netmask '255.255.255.0'
	option ip6assign '60'


config interface 'guest'
	option device 'br-lan.2'
	option proto 'static'
	option ipaddr '192.168.2.1'
	option netmask '255.255.255.0'

config interface 'iot'
	option device 'br-lan.3'
	option proto 'static'
	option ipaddr '192.168.3.1'
	option netmask '255.255.255.0'

config interface 'wan'
	option device 'eth1.201'
	option proto 'pppoe'
	option username 'usernameusername'
	option password 'PASSPASSPASS'
	option ipv6 'auto'
	option peerdns '0'
	list dns '1.1.1.1'
	list dns '1.0.0.1'

config interface 'wan6'
	option device 'eth1'
	option proto 'dhcpv6'

config device
	option type '8021q'
	option ifname 'eth1'
	option vid '201'
	option name 'eth1.201'


config bridge-vlan
	option device 'br-lan'
	option vlan '1'
	list ports 'lan1:u*'
	list ports 'lan4:u*'

config bridge-vlan
	option device 'br-lan'
	option vlan '2'
	list ports 'lan2:u*'
	list ports 'lan4:t'

config bridge-vlan
	option device 'br-lan'
	option vlan '3'
	list ports 'lan3:u*'
	list ports 'lan4:t'

cat /etc/config/wireless:


config wifi-device 'radio0'
	option type 'mac80211'
	option path 'platform/soc/18000000.wifi'
	option channel '1'
	option band '2g'
	option htmode 'HE20'
	option cell_density '1'
	option country 'US'

config wifi-iface 'default_radio0'
	option device 'radio0'
	option network 'lan'
	option mode 'ap'
	option ssid 'mywifi'
	option encryption 'psk2'
	option key 'KEYKEYKEY'

config wifi-device 'radio1'
	option type 'mac80211'
	option path 'platform/soc/18000000.wifi+1'
	option channel '36'
	option band '5g'
	option htmode 'HE80'

config wifi-iface 'default_radio1'
	option device 'radio1'
	option network 'lan'
	option mode 'ap'
	option ssid 'mywifi_5G'
	option encryption 'psk2'
	option key 'KEYKEYKEY'

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'


config dhcp 'guest'
	option interface 'guest'
	option start '100'
	option limit '150'
	option leasetime '12h'
	option dhcpv4 'server'

config dhcp 'iot'
	option interface 'iot'
	option start '100'
	option limit '150'
	option leasetime '12h'
	option dhcpv4 'server'

cat /etc/config/firewall:

config defaults
	option syn_flood	1
	option input		REJECT
	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

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 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 zone
	option name 'guest_zone'
	list network 'guest'
	option input 'REJECT'
	option output 'ACCEPT'
	option forward 'REJECT'

config zone
	option name 'iot_zone'
	list network 'iot'
	option input 'REJECT'
	option output 'ACCEPT'
	option forward 'REJECT'

config forwarding
	option src 'lan'
	option dest 'guest_zone'

config forwarding
	option src 'lan'
	option dest 'iot_zone'

config forwarding
	option src 'guest_zone'
	option dest 'wan'

config forwarding
	option src 'iot_zone'
	option dest 'wan'

config rule
	option name 'Guest-DNS-DHCP'
	option src 'guest_zone'
	option dest_port '53 67 68'
	option target 'ACCEPT'

config rule
	option name 'IoT-DNS-DHCP'
	option src 'iot_zone'
	option dest_port '53 67 68'
	option target 'ACCEPT'

brada4 · August 3, 2024, 5:05am

Your router is NOT and ISP gateway, that one is in a cable booth somewhere in the street.

1 Typically you dont use bleeding edge software for security.
2 no idea, if it works as you say dont change anything
3 OMG, did you hire a consultant to plug first five cables?

lleachii · August 3, 2024, 5:18am

???

Did I miss something in the OP's post?

brada4 · August 3, 2024, 5:19am

The weirdest security concerns with one-off terminology.