SIP1 is a yo-yo at the moment

There have been 5 outages of sip1.sipsorcery.com in the last 24 hours which is verging on the ridiculous. I’ve even swapped IP addresses between sip1 and sip2 to see if the issue was constrained to one physical instance but that didn’t work.

I’m not getting much love from Amazon support Access outages seem to be caused by traffic volumes so at this point I’m not hopeful for smooth operation of sipsorcery.

My hypothesis is that an Amazon network element is blacklisting the sipsorcery server due to its traffic profile of lots of small UDP packets or something. The evidence being that only the 174.129.236.7 server ever fails and it’s the one with 80% of the traffic. Also from the server logs I can see that the server doesn’t crash and the sipsorcery servers are keep running trying to talk to the outside World it’s just that no network traffic can get in and out.

The worry is that once the primary server fails the traffic levels will build up on the secondary server and it will get blacklisted as well.

  1. Perk’s avatar

    Just in case things with AWS don’t work out, you may want to look at 1and1.com ‘s new “Cloud Services”. Fixed monthly pricing (very reasonable), they offer Windows 2008, and the transfered MB volume is the only thing metered, no request volume metering. Also a real static IP address. Lenexa KS based servers (last time I checked).

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  2. sipsorcery’s avatar

    Thanks, I was aware of raskspace but hadn’t heard of 1and1. I’m still crossing my fingers that Amazon’s EC2 will work out, I’ve invested a lot of time in understanding its quirks and moving will mean starting that process all over again!

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  3. doohickey’s avatar

    I wouldn’t touch any 1and1 services with a ten foot pole. They have some strange and unfriendly business practices.

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  4. webby’s avatar

    I agree with doohickey. 1&1 may seem to be reasonable at first and I’ve been lucky with a couple of sites I admin, but on another couple it’s totally outweighed any benefit on the other. Haven’t used the Cloud Services, so I can’t speak specifically about that though.

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    1. Perk’s avatar

      I understand your concern on site hosting. However, I have had dedicated servers ( linux) for 5 years and no problems.I also have servers at The Planet with equal reliability.

      You are fully responsible for the box at 1and1, more so than at The Planet. However you get the tools, programable Cisco hardware firewalls, remote re-imaging and serial console access (over ssh) to do this.

      I have heard bad things about their site hosting and domain name registration, but if you want a dedicated box or some cloud, and you know how to manage the O/S, they are fine.

      Network support and hardware repair requests fine, O/S and trouble shooting support are hit and miss. The Planet has very good support at higher prices.

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    2. tom’s avatar

      you already make use of .NET framework. i am just wondering if microsofts azure platform wold be suitable for host sipsorcery?

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      1. sipsorcery’s avatar

        Windows Azure doesn’t support UDP so unfortunately it’s not an option. SQL Azure is being used as the database backend for sipsorcery and I’ve got the sipsorcery web site and services 99% working on Windows Azure, just need to find a way to send the sign up emails.

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      2. Seth Wisely’s avatar

        On 1n1 my vote is: -1 + -1

        ^ if I ha(d|ve) a vote

        If dreamhost or pair had a cloud I would be more inclined to vote +1

        “Windows Azure doesn’t support UDP”

        :n:

        I’m surprised an Amazon peon hasn’t chimed in here yet.

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        1. sipsorcery’s avatar

          Ultimately I did get a PM from an Amazon rep via the Amazon forum and he suggested something to try out which unfortunately didn’t end up working out, at least my whining eventually illicited a response.

          I’m now pretty confident the issue is to do in the networking driver either included or between the Xen hypervisor and Windows. I’ve exhausted every avenue with the EC2 now so I will be moving the sipsorcery service to a different cloud service and one that uses the Microsoft hypervisor which can be expected to work properly with Windows. However, there’s a few budgetary concerns with the move so for the time being the service will stay on EC2 and provided the failures stay at the recent rate of one every couple of weeks (fingers very tightly crossed) the impact should be negligible.

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