Performance issues on Citylink yesterday (Saturday Jul 19)
Our apologies to the folks who suffered from performance problems on Citylink yesterday (Saturday). They were caused by an ISP under apparent SYN attack - not in itself a particularly unusual occurence, what was interesting was that in changes on Saturday morning (about 3am) said ISP managed to make the IP address under attack an unfiltered broadcast address on Citylink, so we all got to share the pain of a kind of combo SYN/smurf attack. The attacks manifested as 8-10Mb/s streams coming from the ISP onto Citylink for 1-4 minutes, about twice every two hours, which in turn caused some 10Mb customers on Citylink some disruption of service - 100Mb/1Gb customers seemed to be largely unaffected. The short duration and occasional nature of the problem did cause a few issues with tracking it and getting a resolution (about 9pm last night) - again, our apologies for not getting it sorted faster. Cheers Si
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Simon Blake