Thank Marco for your concerns.

With the new LTE dongle not working properly, but when it works

traceroute -I 2a01:170:118f:1::1
traceroute to 2a01:170:118f:1::1 (2a01:170:118f:1::1), 30 hops max, 80 byte 
packets
 1  ik41.home (2a04:cec0:104d:c3d0:b163:755:4f7b:7d44)  1.140 ms  1.237 ms *
 2  2a04:cec0:104d:c3d0:0:57:ca48:7740 (2a04:cec0:104d:c3d0:0:57:ca48:7740)  
33.437 ms  42.443 ms *
 3  * * *
 4  2001:860:b205:5100::1c:1 (2001:860:b205:5100::1c:1)  42.989 ms  43.048 ms  
43.075 ms
 5  2001:860:b205:5100::15:2 (2001:860:b205:5100::15:2)  42.722 ms  42.758 ms  
42.770 ms
 6  2001:860:b205:5100::11:4 (2001:860:b205:5100::11:4)  43.113 ms * *
 7  2001:860:bbe0:f6::1 (2001:860:bbe0:f6::1)  32.788 ms * *
 8  2001:860:bbee:d9::1 (2001:860:bbee:d9::1)  35.728 ms * *
 9  * * *
10  * * *
11  2003:0:130e:9::2274:1 (2003:0:130e:9::2274:1)  47.779 ms  51.888 ms  47.805 
ms
12  2a01:170:118f:1::1 (2a01:170:118f:1::1)  56.947 ms  55.344 ms  55.370 ms

Same dongle after ~ 1 minute
traceroute to 2a01:170:118f:1::1 (2a01:170:118f:1::1), 30 hops max, 80 byte 
packets
 1  _gateway (fe80::dcb1:beff:fe30:9ee8%enp0s20f0u11)  2.088 ms !N  2.527 ms !N 
 2.823 ms !N

With the working LTE
connect: Network is unreachable

traceroute -I 8.8.8.8
Same answer before and after wit hthe new LTE
traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets
 1  * * *
 2  * * *
 3  * * *
 4  * * *
 5  * * *
 6  * * *
 7  * * *
 8  * * *
 9  * * *
10  * * *
11  * * *
12  * * *
13  * * *
14  * * *
15  * * *
16  * * *
17  * * *
18  * * *
19  * * *
20  * * *
21  * * *
22  * * *
23  * * *
24  * * *
25  * * *
26  * * *
27  * * *
28  * * *
29  * * *
30  * * *

With the the working LTE
traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets
 1  _gateway (192.168.1.1)  0.957 ms  1.164 ms  1.363 ms
 2  10.125.68.5 (10.125.68.5)  98.259 ms  106.266 ms  106.334 ms
 3  172.20.24.122 (172.20.24.122)  114.882 ms  114.958 ms  115.144 ms
 4  172.20.24.98 (172.20.24.98)  115.199 ms  115.352 ms  115.603 ms
 5  * * *
 6  212.194.171.69 (212.194.171.69)  115.486 ms * *
 7  * * *
 8  142.250.175.198 (142.250.175.198)  23.918 ms * *
 9  * * *
10  * 142.251.49.131 (142.251.49.131)  27.228 ms  25.073 ms
11  dns.google (8.8.8.8)  23.883 ms  24.983 ms  25.018 ms


When the new LTE dongle, when it is working
I have
default route 192.168.8.1
DNS 192.168.8.1

When it does not work
default route 192.168.8.1
fe80::dcb1:beff!fe30:9ee8
DNS4 192.168.8.1
DNS6 fe80::dcb1:beff!fe30:9ee8

And with the working dongle
default route 192.168.1.1
DNS 192.168.1.1


Please not that I have a single SIM that I switch and switch back from one 
dongle to the other one.



>
> Am Wed, 19 Mar 2025 23:24:31 +0100
> schrieb Patrick Dupre via users <users@lists.fedoraproject.org>:
>
> > Do I need to switch IPV6 from automatic to
> > Disable or Automatic DHCP, manual ?
> > or set the IPV6 DNS
>
> No, but it needs to be investigated what it doesn't work. You get
> addresses assigned.
>
> Please test
> traceroute -I 2a01:170:118f:1::1
> traceroute -I 8.8.8.8
>
> This doesn't involve DNS at all, so first check the IP connectivity.
> --
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