[AusNOG] (Probably a bit OT) IPv6 oddity

[Michael Junek]

2 from 2 of the Arcadyan modems supplied to other family by Telstra have exhibited the same issue. Whirlpool is full of complaints of similar things. Something to do with UPNP apparently.

"Intermittent internet access" is the typical reported fault, however when debugging the issue I found the working sites were all IPv6 and the non-working ones were IPv4 only.


As not to get to get more tech support calls from family, the Telstra boxes were reassigned to be dumb ATA's only (seeing you cant get the SIP config from Telstra) and a MikroTik router was placed in front doing the work and heavy lifting from the NBN NCD.


Both premises were FttC.



________________________________
From: AusNOG <ausnog-bounces at lists.ausnog.net> on behalf of Jamie Lovick <jalovick at doof.org>
Sent: Tuesday, 15 October 2019 19:57
To: Karl Auer
Cc: AUSNOG
Subject: Re: [AusNOG] (Probably a bit OT) IPv6 oddity

I've seen those Optus branded Netgear cable routers stop handing out DHCP to the local network, but will continue to route just fine. Typically, if there is bad power (brownouts, etc.), this can happen.

Jamie

On Tue, 15 Oct 2019 at 3:05 pm, Karl Auer <kauer at biplane.com.au<mailto:kauer at biplane.com.au>> wrote:
Had an interesting (to me) case last week. Client rang on his mobile to
say his phones didn't work and also he couldn't get to his bank or
anything else - except Google. Also, I found I was able to use
TeamViewer to access one of his PCs.

He's on NBN over FTTC (or maybe FTTN) with Telstra.

Turned out his Telstra router was supplying a valid prefix to
autoconfigure IPv6 addresses in, but it was not supplying IPv4
addresses via DHCP. Reset the router and it all came good.

This is the first time I've seen this in the wild where it was not a
misconfiguration (though I'm the first to admit that "the wild" is more
of an inoffensive thicket in my case). Is it more common than I think?

Regards, K.

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