vps/hosts/gw.md

gw — EdgeRouter X primary LAN gateway

Role and access

Item	Value
Role	Primary router for the 192.168.66.0/24 and 192.168.55.0/24 LANs
IPv4	192.168.66.254
Verified hostname	gw
SSH	ssh -4 zhiqiang@192.168.66.254
Platform	Ubiquiti EdgeRouter X 5-Port, EdgeOS v3.0.1 (Build 5862409)
Kernel	4.14.54-UBNT
Time zone	Asia/Shanghai

Use zhiqiang as the default account for all routine gateway operations. Its key-only SSH login and passwordless sudo were verified on 2026-08-04; use BatchMode=yes for unattended read-only checks. ubnt remains an existing administrative account, but is not the routine operations entry point.

Do not store account passwords, PPPoE credentials, SSH keys, configuration password hashes, or UISP/UNMS connection strings in this repository. Both administrative accounts have EdgeOS configuration and sudo privileges. Verify a new SSH host key out of band before accepting it.

Network topology

Interface	Address / role
eth0	192.168.66.254/24; LAN 66
switch0 (eth1–eth3)	192.168.55.254/24; LAN 55
eth4	WAN physical port; PPPoE uplink
pppoe0	WAN default route; MTU 1492; IPv6 prefix delegation /60

IPv6 prefix delegation assigns SLAAC-capable /64 networks to both LANs. eth4 applies the WAN IPv4 and IPv6 firewall policies.

Detailed effective configuration, including firewall binding and WAN exposure, is recorded in the EdgeRouter X configuration record.

Services and policy

• DHCP serves both LANs with 24-hour leases. Client DNS is 192.168.66.36. Pools are .38–.243 on both networks; selected infrastructure and client addresses have static mappings. The UniFi controller is advertised as 192.168.66.46.
• DNS forwarding listens on eth0 and switch0 with a cache size of 512.
• WAN NAT masquerades all IPv4 traffic leaving pppoe0.
• WAN_IN and WAN_LOCAL default to drop, permitting established/related sessions and rejecting invalid state. Equivalent IPv6 policies permit necessary ICMPv6 and DHCPv6 traffic.
• LAN_IN defines a default drop plus explicit 55 → 66 and 66 → 55 allows, but it is not currently applied to an interface. The active inter-VLAN posture is therefore ordinary routed access: LAN55 and LAN66 can communicate bidirectionally unless a different active policy intervenes. LAN_OUT is likewise defined but inactive; WAN policies are active on pppoe0.
• Management services: SSH on TCP 22; EdgeOS GUI on HTTP 80 and HTTPS 443.

Safe inspection

Use the EdgeOS operational CLI for routine inspection. show configuration commands can expose credentials and remote-management tokens, so either avoid copying it or filter sensitive lines before recording output.

ssh -4 -o BatchMode=yes zhiqiang@192.168.66.254
show version
show interfaces
show ip route
show system uptime
show firewall

The official EdgeOS User Guide explains that a firewall policy is a ruleset and must be applied to the relevant interface/direction to take effect. Use the operational show firewall output—not merely the configured rule definitions—to determine the effective policy.

PPPoE redial

To force the pppoe0 session to reconnect (e.g. to obtain a fresh WAN IP), use the operational disconnect / connect commands — not renew dhcp interface, which applies only to DHCP interfaces:

ssh -4 zhiqiang@192.168.66.254
/opt/vyatta/bin/vyatta-op-cmd-wrapper disconnect interface pppoe0
/opt/vyatta/bin/vyatta-op-cmd-wrapper connect interface pppoe0

disconnect tears down the PPP session; connect re-dials immediately. A short pause between them (a few seconds, or minutes for cautious ISPs) lets the old session finish teardown before redialing. This briefly drops the whole WAN uplink and may change the public IPv4 and delegated IPv6 /60; in-flight sessions and port-forwarded services are interrupted until the new session is up.

The zhiqiang account logs into vbash, not the EdgeOS CLI, so operational commands must be invoked through /opt/vyatta/bin/vyatta-op-cmd-wrapper and depend on its passwordless sudo. The ubnt account lands directly in the operational CLI, where the same commands are entered without the wrapper.

Maintenance notes

• EdgeOS writes persistent changes through its configuration tree: enter configure, make the intended change, then run commit and save.
• The current SSH service reported a non-post-quantum key-exchange warning. Treat any cryptography or SSH-policy maintenance as a planned, lockout-safe change following the repository SSH safety procedure.
• This device is distinct from gfw.windy.lan (192.168.66.1), the OpenWrt OpenClash gateway. Do not apply OpenWrt procedures to this router.

Verification record

Configuration and reachability were checked by read-only SSH on 2026-08-04. No network policy changes were made during that inspection. The zhiqiang account password was subsequently rotated using the EdgeOS configuration tree and verified by a separate SSH login; the password is intentionally not recorded here.

Inter-VLAN access was rechecked by read-only SSH on 2026-08-05. A probe sourced from 192.168.55.254 reached the UniFi controller at 192.168.66.46 with 3/3 ICMP replies. This supports the AP Inform path to 192.168.66.46:9080; the controller listener and an online LAN55 AP provide the corresponding application-level evidence. No firewall changes were made.