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HTTP(S) stop working, all other connection types persist on LTE wAP

Mon Oct 12, 2020 7:29 pm

I am looking for help in how to diagnose a problem in my network (or suggestions for a solution if something seems obvious).
I'm almost certain the problem is with the Mikrotik wAP (and not the router), based on the fix, but could be wrong.

My setup:
provider: mobile broadband service through AT&T SIM card (LTE)
modem: Mikrotik wAP LTE (US) // RBwAPR-2nD&R11e-LTE-US
router: Ubiquiti EdgeRouter X SFP // ER‑X‑SFP
mgmt: Unifi Cloud Key // UC‑CK
clients: wireless and wired; windows, mac and linux (just me)

I'm almost always on a VPN (wireguard) throughout the day and am the only one on the LAN doing so.

My problem:

This network setup has been running fine for the last 6+ months. Over the last three weeks, **all** clients suddenly lose the ability to connect to the internet. This includes wired and wireless clients and all operating systems. The clients maintain their leases to the LAN.

Observations when it happens:
- all clients on the LAN cannot browse the internet except my machine, which is on a wireguard VPN
- Email ports/protocols appear to work fine
- I can continue to browse the internet while I'm connected to the VPN
- However, when I disconnect from the VPN:
- I then am unable to browse the internet as well
- I can still ping so DNS resolution does not appear to be the problem
- curl seems to indicate that it is trying to do something with IPv6 (see below) however I have never enabled or configured the modem or router to use IPv6

curl when issue is active and I disconnect from VPN to experience it:
-> % curl -v
*   Trying
*   Trying 2607:f8b0:4005:807::200e...
* Immediate connect fail for 2607:f8b0:4005:807::200e: Network is unreachable
*   Trying 2607:f8b0:4005:807::200e...
* Immediate connect fail for 2607:f8b0:4005:807::200e: Network is unreachable
...however I can still ping
-> % ping
PING ( 56(84) bytes of data.
64 bytes from ( icmp_seq=1 ttl=111 time=32.2 ms
curl normally (when not having issue):
-> % curl -v
*   Trying
* Connected to ( port 80 (#0)
> GET / HTTP/1.1
> Host:
> User-Agent: curl/7.64.0
> Accept: */*
< HTTP/1.1 301 Moved Permanently
< Location:
< Content-Type: text/html; charset=UTF-8
< Date: Wed, 23 Sep 2020 18:11:24 GMT
< Expires: Fri, 23 Oct 2020 18:11:24 GMT
< Cache-Control: public, max-age=2592000
< Server: gws
< Content-Length: 219
< X-XSS-Protection: 0
< X-Frame-Options: SAMEORIGIN
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<H1>301 Moved</H1>
The document has moved
<A HREF="">here</A>.
* Connection #0 to host left intact
My Immediate Fix:

When this happens, I ssh onto the Mikrotik modem and restart it, which seems to restore things back to normal, but the problem can pop up again in a few hours or days (if lucky).

Obviously, constantly restarting the modem is not a long-term strategy.

I'm trying to determine the best way to attempt to capture more information in logs about what could be causing this issue so that I can figure out a better long-term fix.

My question(s):

If anyone has any immediate ideas as to why this might be happening, I'd love to hear them.

Otherwise I would love advice on where else to look on the modem and router to get some log information about these events.

Extra details on the router config. Pretty much all defaults.
$ ip route
default via dev eth4 proto zebra dev switch0 proto kernel scope link src dev eth4 proto kernel scope link src

$ show configuration | grep -i ipv6
    ipv6-receive-redirects disable
    ipv6-src-route disable
Extra details on the modem config. Also all default (other than APN config).
The following default configuration has been installed on your router:
LTE CPE Router with wireless AP:
 * lte interface connected to providers network (WAN port);
 * WAN port is protected by firewall and enabled DHCP client
LAN Configuration:
    IP address is set on bridge (LAN port)
    DHCP Server: enabled;
    DNS: enabled;
wlan1 Configuration:
    mode:                ap-bridge;
    band:                2ghz-b/g/n;
    tx-chains:           0;1;
    rx-chains:           0;1;
    installation:        outdoor;
    ht-extension:        20/40mhz-XX;
WAN (gateway) Configuration:
    gateway:  lte1 ;
    ip4 firewall:  enabled;
    NAT:   enabled;

[admin@MikroTik] /interface lte> info lte1 once
           pin-status: ok
  registration-status: registered
        functionality: full
         manufacturer: MikroTik
                model: R11e-LTE-US
             revision: MPSS: R11eL_v12.09.174661 APSS: R11eL_v02.14.174662 CUSTAPP:
     current-operator: AT&T
    access-technology: Evolved 3G (LTE)
                 rssi: -71dBm
                 rsrp: -108dBm
                 rsrq: -14dB

[admin@MikroTik] /system routerboard> print
       routerboard: yes
        board-name: wAP R
             model: RBwAPR-2nD
     serial-number: ************
     firmware-type: qca9531L
  factory-firmware: 3.41
  current-firmware: 6.46.4
  upgrade-firmware: 6.46.4

[admin@MikroTik] /interface lte> print
Flags: X - disabled, R - running
 0  R name="lte1" mtu=1480 mac-address=**:**:**:**:**:** apn-profiles=att  network-mode=gsm,3g,lte

[admin@MikroTik] /interface lte apn> print
Flags: * - default
 0 * name="att" apn="broadband" use-peer-dns=yes add-default-route=yes default-route-distance=2

[admin@MikroTik] /ip address> print
Flags: X - disabled, I - invalid, D - dynamic
 #   ADDRESS            NETWORK         INTERFACE
 0   ;;; defconf    bridge
 1 D **.**.**.**/32     **.**.**.**     lte1

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