{"id":23466,"date":"2020-08-06T08:05:56","date_gmt":"2020-08-06T07:05:56","guid":{"rendered":"https:\/\/www.ispreview.co.uk\/?p=23466"},"modified":"2020-08-06T08:05:56","modified_gmt":"2020-08-06T07:05:56","slug":"virgin-media-uk-move-to-fix-20mbps-speed-cap-on-ipv6-tunnels","status":"publish","type":"post","link":"https:\/\/www.ispreview.co.uk\/index.php\/2020\/08\/virgin-media-uk-move-to-fix-20mbps-speed-cap-on-ipv6-tunnels.html","title":{"rendered":"Virgin Media UK Move to Fix 20Mbps Speed Cap on IPv6 Tunnels"},"content":{"rendered":"

Broadband ISP Virgin Media<\/a> is finally moving to develop a fix for a long-running, albeit quite technically niche problem, which severely throttles IPv4 internet traffic – often reducing download speeds to under 20Mbps – when the data packets carry Protocol 41 (i.e. the IPv6 encapsulation \/ tunnel protocol).<\/p>\n

Granted, that\u2019s not the catchiest of news titles, but then this does represent quite a niche bug. ISPreview first became aware of this problem a year ago, but at the time it was only being reported by a tiny number of people, although Virgin Media<\/a>’s long-running struggle to properly implement IPv6 internet addresses has meant that a growing number of users are starting to run into the same issue.<\/p>\n

At present customers are only assigned an IPv4 address, although naturally some of the provider’s more technically minded customers still want to be able to use the latest IPv6 standard. One way of achieving that is by harnessing a 6in4 tunnel service via Protocol 41<\/strong> (IPv6 encapsulation), which works with a third-party service (e.g. Tunnel Broker<\/a>) to embed IPv6 packets inside IPv4 packets.<\/p>\n

On most UK broadband providers this works fine and has little to no discernible impact on your connection speed, unless you happen to be a Virgin Media<\/a> customer with one of their HUB 3.0 (SuperHub v3), Hitron or older routers. As one customer, Chris, told us: “Specifically, 6in4 tunnels that originate from a VM IPv4 address are limited to ~20 Mbit\/s downstream throughput, even though the VM connection is easily capable of far more (500 Mbit\/s in my case)<\/em>.”<\/p>\n

Virgin Media did initially probe this problem last summer (here<\/a>), but oddly the operator concluded that such connections were running correctly “and they can see no issues with speed\/reliability … we do not traffic manage \/ traffic shape our broadband connections, however VPN and other forms of tunnel connection are not supported and we cannot guarantee a perfect connection between points<\/em>.”<\/p>\n

Naturally that didn’t go down particularly well, not least since the issue is clearly not due to the endpoint equipment nor the tunnel itself but something on the VM network. Meanwhile an increasing number of customers have become tired of waiting for IPv6 and thus more of them are now starting to run into the same problem (here<\/a> and here<\/a>). The issue also seems to be present on both their business and residential service.<\/p>\n

We began raising this problem with the operator last week and, after a bit of nudging, it appears as if they may finally be prepared to resolve it.<\/p>\n

A Virgin Media Spokesperson told ISPreview.co.uk:<\/strong><\/p>\n

“We’re currently investigating this issue further which affects those customers who choose to use 6in4 IPv6 tunnels. This may require a firmware update from the vendor to fix the problem.”<\/p><\/blockquote>\n

At present it’s unclear when such a firmware update might be released (bug fixes from VM have a tendency to take a long time..) and whether or not they’ll be doing that for all of their affected routers, or only some of them. On this point we note that customers who have recently upgraded to their top 1Gbps (DOCSIS<\/a> 3.1) package with the latest HUB 4.0<\/strong> router do not appear to suffer the same issue.<\/p>\n

We also asked for an update on Virgin Media’s much delayed IPv6 roll-out plan, although the response we got back merely echoed what they said last year: “We’re currently in the process of finalising our plans for IPv6 deployment and will provide an update at the appropriate time<\/em>.” We wonder which will come first, VM’s IPv6 roll-out or a fix for the 6in4 tunnels bug.<\/p>\n","protected":false},"excerpt":{"rendered":"

Broadband ISP Virgin Media is finally moving to develop a fix for a long-running, albeit quite technically niche problem, which severely throttles IPv4 internet traffic – often reducing download speeds to under 20Mbps – when the data packets carry Protocol 41 (i.e. the IPv6 encapsulation \/ tunnel protocol).<\/p>\n","protected":false},"author":1,"featured_media":23467,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[1],"tags":[88,475],"class_list":["post-23466","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uk_isp_news","tag-ipv6","tag-virgin-media"],"share_on_mastodon":{"url":"","error":""},"yoast_head":"\nVirgin Media UK Move to Fix 20Mbps Speed Cap on IPv6 Tunnels - ISPreview UK<\/title>\n<meta name=\"description\" content=\"Broadband ISP Virgin Media is finally moving to develop a fix for a long-running, albeit quite technically niche problem, which severely throttles IPv4\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ispreview.co.uk\/index.php\/2020\/08\/virgin-media-uk-move-to-fix-20mbps-speed-cap-on-ipv6-tunnels.html\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Virgin Media UK Move to Fix 20Mbps Speed Cap on IPv6 Tunnels - 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