4G LTE router - MR600 - cannot route IPv4 from local net on IPv4+IPv6 profile

[george25x]

The Archer MR600 router only supports IPv4 connection profile by default for EE.

I have create a new profile with PDP type as IPv4&IPv6, connected successfully, apparently EE assigns 2 public IPs, as per below IP test from a website:

Your IPv4 address on the public Internet appears to be 31.94.xx.44
Your IPv6 address on the public Internet appears to be 2a00:23ee:11b0:454b:1af5:xx:1407:f5ba

However if I try to access any site by IPv4, it fails:

$ ping 1.1.1.1
PING 1.1.1.1 (1.1.1.1) 56(84) bytes of data.
From 192.168.1.1 icmp_seq=1 Destination Net Unreachable
From 192.168.1.1 icmp_seq=2 Destination Net Unreachable
From 192.168.1.1 icmp_seq=3 Destination Net Unreachable

$ ping -4 www.google.com
PING www.google.com (216.58.212.228) 56(84) bytes of data.
From _gateway (192.168.1.1) icmp_seq=62 Destination Net Unreachable

 No issues via IPv6:

$ ping -6 www.google.com
PING www.google.com (2a00:1450:4009:80b::2004) 56 data bytes
64 bytes from lhr35s04-in-x04.1e100.net (2a00:1450:4009:80b::2004): icmp_seq=1 ttl=56 time=46.7 ms

The router's IPv4 routing table is empty while on the IPv4-v6 profile:

The same section is populated if I select the IPv4 only connection profile, and I can ping IPv4 sites by name and IP.

ID  Network Destination   Subnet Mask        Gateway         Interface
--  --------------------  -----------------  ---------------  -------------
1   0.0.0.0               0.0.0.0            10.99.88.149    LTE
2   10.99.88.144          255.255.255.248    0.0.0.0         LTE
3   192.168.1.0           255.255.255.0      0.0.0.0         LAN & WLAN

 Here is the new profile, which routes only IPv6 from the local network:

No IPv4 is assigned, but IPv6 is assigned, with the new profile.

The router says that connection failed, although I have internet.

Router details: Firmware Version:<u+202a>1.1.0 0.9.1 v0001.0 Build 220727 Rel.74013n irmwareHardware Version:<u+202a>Archer MR600 v3 00000002

Is there a bug in the firmware, or is there a setting that needs to be changed in the router?

[XRaySpeX]

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@george25x wrote:

No IPv4 is assigned, but IPv6 is assigned, with the new profile.

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In the L-hand rejected (cuz it shows MAC) image IPv4 needs an IPv4 DNS set.

[george25x · Accepted solution]

I have contacted TP-Link support, I have downloaded the beta firmware below and created a connection profile with 464XLAT enabled.

https://static.tp-link.com/upload/beta/2023/202308/20230815/Archer_MR600(EU)_V3_1.1.0_230811.zip

I can now use both IPv4 and IPv6. IPv4 is routed to the internet.