nanog mailing list archives
Re: dns cache beyond ttl - viasat / exede
From: Sabri Berisha <sabri () cluecentral net>
Date: Mon, 7 Oct 2019 10:19:44 -0700 (PDT)
Hi Mike, The UT uses a combination of caching, prefetching, and spoofing to accelerate web traffic for users. On the terrestrial side, there is a cluster of accelerators that also take part in that process. What is the "lag" time that you have observed? Also, do you know if your clients are on the Viasat-1 or Viasat-2 satellite? The infrastructure behind both satellites differs significantly. I used to work for Viasat and have forwarded your mail to a few of my former colleagues. Thanks, Sabri ----- On Oct 7, 2019, at 9:08 AM, Mike mike-nanog () tiedyenetworks com wrote:
Hello, I am moving a number of web sites from one colo to another, re-numbering them in the process, and I have run into an interesting issue I'd like to solicit feedback on. My dns TTL's are all 300 seconds, and I have noticed that once I update the A records with the new addresses, most (but not all) web clients begin using the new address within 5 minutes or so. However, there is a persistent set of stragglers who continue accessing the site(s) on their old addresses for far in excess of this - up to a week in fact. And, what I have noted, all of these clients have something in common - they all appear to be satellite users of viasat/exede. This is based on whois lookups of the ip addresses of the clients. Note, I am NOT expecting 'turn on a time' - just looking for clients to refresh within a reasonable time. I am wondering if perhaps this is due to some kind of (known?) bug in the embedded dns cache/client in the client satellite modem, or if there is another plausible explanation I am not seeing. It compounds my problem slightly since I have to continue running the web sites at both the old and new addresses while these things time out I guess and it's just inconvenient. Thanks. MIke-
Current thread:
- dns cache beyond ttl - viasat / exede Mike (Oct 07)
- Re: dns cache beyond ttl - viasat / exede Andrew Kerr (Oct 07)
- Re: dns cache beyond ttl - viasat / exede Brielle (Oct 07)
- Re: dns cache beyond ttl - viasat / exede William Herrin (Oct 07)
- Re: dns cache beyond ttl - viasat / exede Brielle (Oct 07)
- Re: dns cache beyond ttl - viasat / exede William Herrin (Oct 07)
- Re: dns cache beyond ttl - viasat / exede Brielle (Oct 08)
- Re: dns cache beyond ttl - viasat / exede William Herrin (Oct 07)
- Re: dns cache beyond ttl - viasat / exede Tony Finch (Oct 08)
- Re: dns cache beyond ttl - viasat / exede William Herrin (Oct 08)