Cannot reach one specific IPv6 from one specific network

cross-posted from: lemmy.world/post/224140

My home ISP does CGNAT for IPv4, but provides native IPv6. I can use IPv6 just fine to access most of my resources, except for one specific server. I can access the server over IPv4 from my home network, and either over v4 or v6 from other networks I’ve tried. But I can’t access it over IPv6 from my home network.

What could be the problem here? Where do I begin to diagnose it

giacomo ,
@giacomo@lemmy.world avatar

How far does a traceroute get you? That could help isolate where the issue may be.

TwinTurbo OP ,

I’ve looked at one, but all that I can tell is I stop reaching things somewhere between my ISP and the datacenter the server is in.

giacomo ,
@giacomo@lemmy.world avatar

I kinda think it may be on the isp then, maybe a v6 routing issue? You could work around with an ipv4 tunnel, then route ipv6 through it. If that’s possible, I’ve never done it haha.

TwinTurbo OP ,

Yeah, ISP-related issue is all I can think of. I can connect to the server over v4 no problem, but the broken v6 connectivity to this particular endpoint is strange and nothing I’ve seen before…

giacomo ,
@giacomo@lemmy.world avatar

I bet they get less reports on ipv6 issues than with ipv4. I have definitely seen carriers have ipv4 routing issues in enterprise networking.

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