ARC port forwarding issue (Huawei B535-232)

Same problem here (Italy), see below.
No static IP available from my ISP (Vodafone 4g).

Modem is Huawei B535-232.

Checked that UPnP is active and NAT set on “cone” (other available option being “symmetric”).
Via canyouseeme.org, I get a time out error on port 55000 (tried also other ports to no avail).

{
“connectivity”: {“status”:“NetworkError”,“status_code”:504,“error”:“error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined”},
“external_ip”: {“actual_external_ip”:“83.x.x.x”,“router_external_ip”:null},
“natpmp_autoconfig”: {“status”:“NotFound”},
“upnp_autoconfig”: {“server_ip”:“192.168.8.1”,“found_upnp”:true,“error”:“Did not find UPnP service with WANIPConnection on network”}
}

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{
“connectivity”: {“status”:“NetworkError”,“status_code”:504,“error”:“error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined”},
“external_ip”: {“actual_external_ip”:“213.x.x.x”,“router_external_ip”:null},
“natpmp_autoconfig”: {“status”:“NotFound”},
“upnp_autoconfig”: {“server_ip”:“192.168.8.1”,“found_upnp”:true,“error”:“Did not find UPnP service with WANIPConnection on network”}
}

I am also getting this message.

Same model B535 by the way

I’ve got the same issue with another LTE Huawei router. There’s perhaps an issue with Huawei software. What is your version? I’m currently running on 10.0.2.2 (H190SP1C983).

My version is 10.0.3.1(H195SP4C983)

OK.

EDIT: It is highly likely due to our ISPs using Carrier-grade NAT which is typical with 4g providers. I’ve checked and mine does use CGN. You can see that by comparing your public IP with your WAN IP (on the info page of our router). If both don’t match, your ISP uses CGN and it’s probably why we won’t be able to use ARC as long as we don’t have a dedicated public IP (which doesn’t mean it has to be static but your router has to get an IP which is public). See Tailscale implementation with ARC to circumnavigate ISP CGNAT for a possible workaround.

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