[AusNOG] Azure <-> Fastly connectivity issues in SYD?

[Paul Gear]

Thanks to everyone for your help - I'm in touch with Fastly engineering now.

On 22/3/21 10:45 am, Paul Gear wrote:
> Hi all,
>
> Happy Monday!
>
> If we have any Fastly folks on the list, I'd appreciate your input on 
> what appears to be a connectivity issue between Azure Australia East 
> and Fastly, or a rate limiting problem somewhere behind Fastly's 
> frontend IPs.
>
> I've written up the problem at 
> https://discuss.hashicorp.com/t/intermittent-connectivity-to-registry-terraform-io/22310, 
> but the short version is that the IPv4 addresses 151.101.29.183 and 
> 151.101.30.49 are exhibiting intermittent SYN retransmissions in the 
> TCP handshake from hosts in Azure Australia East.
>
> These issues are not seen in our connectivity to numerous other 
> external sites, nor are they seen from other locations (although it 
> appears Fastly uses GeoDNS so when I attempt name resolution from my 
> NBN connection I get BNE-based addresses rather than SYD-based ones).
>
> Happy to discuss off-list by direct email, via the forum above, or 
> wherever else is easiest for those who have the power to troubleshoot.
>
> Thanks in advance,
> Paul