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uk.telecom.broadband (UK broadband) (uk.telecom.broadband) Discussion of broadband services, technology and equipment as provided in the UK. Discussions of specific services based on ADSL, cable modems or other broadband technology are also on-topic. Advertising is not allowed. |
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#1
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![]() We host our own web site and have a 2 mb leased line for the incoming connections. For web browsing our users connect via an 8 mb (Max Premium?) ADSL line which tends to be capable of 4 to 5 mb download speeds. If the leased line should fail the idea is that the incoming connections to the web site can be routed (DNS failover) via the ADSL connection which is in theory capable of 832 kb. Our monthly ADSL usage varies considerably - between 15 gb and 30 gb in the last 3 months. I'd feel happier with a 2 mb SDSL circuit as a backup to the leased line. Do you think the web browsing speeds would be noticeably worse with an SDSL service? Any recommendations? I was thinking about Eclipse. |
#2
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![]() Not at all, depending on contention. I had an SDSL in sidcup from freedom to surf, and gave us uploads in the region of 180k/s twice that of your MAX ADSL. Only thing was as SDSL is so rare, no one could be got out to fix it quickly if it went over. unless we paid a ransom in extra care payments, we were going to be off for 7+ days every time it went over. after the second event in 6 months, we ceased it and rented a dedicated server from Pipex. Cheaper too and peace of mind Regards, Keith ( who thinks SDSL is *** SERIOUSLY *** overpriced !!!) Paul Welsh wrote: We host our own web site and have a 2 mb leased line for the incoming connections. For web browsing our users connect via an 8 mb (Max Premium?) ADSL line which tends to be capable of 4 to 5 mb download speeds. If the leased line should fail the idea is that the incoming connections to the web site can be routed (DNS failover) via the ADSL connection which is in theory capable of 832 kb. Our monthly ADSL usage varies considerably - between 15 gb and 30 gb in the last 3 months. I'd feel happier with a 2 mb SDSL circuit as a backup to the leased line. Do you think the web browsing speeds would be noticeably worse with an SDSL service? Any recommendations? I was thinking about Eclipse. |
#3
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![]() Paul wrote on 7 Dec 2006 13:45:21 -0800: We host our own web site and have a 2 mb leased line for the incoming connections. For web browsing our users connect via an 8 mb (Max Premium?) ADSL line which tends to be capable of 4 to 5 mb download speeds. If the leased line should fail the idea is that the incoming connections to the web site can be routed (DNS failover) via the ADSL connection which is in theory capable of 832 kb. Our monthly ADSL usage varies considerably - between 15 gb and 30 gb in the last 3 months. I'd feel happier with a 2 mb SDSL circuit as a backup to the leased line. Do you think the web browsing speeds would be noticeably worse with an SDSL service? Any recommendations? I was thinking about Eclipse. DNS failover isn't a great backup solution - in order for it to work you have to use really low caching times, which means that you then increase the DNS traffic. If you use longer caching times then when you have a failure some customers may not be able to get to your servers due to their ISP or local DNS caches still having the address that is no longer working. We're using Easynet 2Mbps SDSL here and it's great, it actually feels faster than the 2Mbps ADSL I have at home (I'm on MaxDSL now but due to congestion at the exchange I'm still only getting 2Mbps instead of the BRAS value of 5500kbps). We used to have a 2Mbps leased line, the SDSL has been just as reliable and a lot cheaper. We've currently got only ISDN backup on it, but we're looking at moving this to ADSL or SDSL (both options are quite expensive unfortunately) - the advantage this has over DNS failover is that we can keep our DNS TTLs high to keep DNS traffic low, and re-routing to the backup line is done by the ISP so our IP addresses don't change and the process is transparent from the customer point of view (albeit somewhat slower over ISDN, but it's better than nothing). The other option I'm looking at is co-location, up till recently it wasn't possible for us to do this but it's now a definite contender, and means that local connection problems will only cause small delays in order processing rather than potential loss of customers, and our sites would be on a much faster connection. Dan |
#4
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![]() On 7 Dec 2006 13:45:21 -0800, "Paul Welsh" wrote: We host our own web site and have a 2 mb leased line for the incoming connections. For web browsing our users connect via an 8 mb (Max Premium?) ADSL line which tends to be capable of 4 to 5 mb download speeds. If the leased line should fail the idea is that the incoming connections to the web site can be routed (DNS failover) via the ADSL connection which is in theory capable of 832 kb. Our monthly ADSL usage varies considerably - between 15 gb and 30 gb in the last 3 months. I'd feel happier with a 2 mb SDSL circuit as a backup to the leased line. Do you think the web browsing speeds would be noticeably worse with an SDSL service? Any recommendations? I was thinking about Eclipse. We do a very popular 2Mbps leased line with ADSL/SDSL failover that *isn't* dependent on DNS changes, it's done with OSPF, so you don't have to faff around with fiddly changeovers. The whole lot probably costs less than your leased line alone :-) You don't have to make any phyiscal changes either as it's all presented to you as Ethernet on one router, all you have to do is plug your firewall in. Drop me a line, jake dot perks at entagroup dot com, if it's of interest. Jake -- Address munged but valid - remove mungbeans. |
#5
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![]() On 8 Dec 2006, "Spack" wrote: when you have a failure some customers may not be able to get to your servers due to their ISP or local DNS caches still having the address that is no longer working. Although I'm not a customer, it might be worth mentioning AAISP (aa.nu) which has certainly offered a backup connection (in the past) where the backup would get the same fixed IP as the "main" connection. SDSL might be very expensive, however, but if they offered SDSL as first link and a DSL Max Premium as the backup (so not usually available, of course) the cost might be low enought to be considered, and it shouldn't have many of the DNS change/cache problems that might otherwise be the case. It was on their old price list (still worth checking, I'd have thought, to see if they can offer an Office Max as a backup): Extra line £20.00 £23.50 - 2M/250K Additional office grade circuits at the same site on the same base login. http://aa.nu/aa/aaisp/oldprices.html I'm assuming the "same base login" means this 'extra line' would be given the same IP (and of course only one connection could be active at a time, so they'd route the traffic to/from whichever of them was 'live'). They also have a unit called the Firebrick which I think will handle two WAN connections and switch as needed :-) (NB Firebrick is not cheap!) |
#6
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![]() Spack wrote: DNS failover isn't a great backup solution - in order for it to work you have to use really low caching times, which means that you then increase the DNS traffic. If you use longer caching times then when you have a failure some customers may not be able to get to your servers due to their ISP or local DNS caches still having the address that is no longer working. We're using Easynet 2Mbps SDSL here and it's great, it actually feels faster than the 2Mbps ADSL I have at home (I'm on MaxDSL now but due to congestion at the exchange I'm still only getting 2Mbps instead of the BRAS value of 5500kbps). We used to have a 2Mbps leased line, the SDSL has been just as reliable and a lot cheaper. We've currently got only ISDN backup on it, but we're looking at moving this to ADSL or SDSL Points taken but we'd use a third party to provide the DNS failover so low TTLs not really an issue. I considered Easynet but quite honestly we were going from a v. expensive leased line from UUNET / MCI and so the BT leased line we now have represented a substantial saving (they do various special offers etc). Easynet was cheaper still but since we already had fibre it seemed a shame to waste it. The advantage with having 2 separate lines and IP address ranges is that usually connectivity problems arise because of routing issues with the ISP. The service degrades rather than stops. Having 2 independent connections with different ISPs helps get around this issue. |
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