Nick Warne wrote:
> The reason I asked is for the last 6 weeks I was getting symptoms of a DDoS
> attack about 4 to 5 times a day (no disconnection, just the Internet went
> awol for 5 to 10 minutes - everything timing out). My ISP checked everything
> (I have a business deal 20:1) and they couldn't find out what was happened -
> but traceroutes revealed that when it happened, I was getting 70% packet loss
> and ping rose to over 1000.
I had similar experiences, including my pptp connection going down.
> Out of desperation I got Ask to remove me from the pool - and since then, my
> connection has been super fast.
>
> So I was wondering if the UK has finally over-subscribed the DSL* and now it
> makes a 256/512 DSL unsuitable for running a pool server in the UK.
>
> Nick
> * Ask also mentioned it may be my router cracking up, unable to hanlde the
> UDP
> traffic - but it has been OK for 18 months...
It could be... I promoted an old PC to "firewall/router" (installing
additional ethernet cards and Linux) and the ip_conntrack module gave up:
kernel: ip_conntrack: table full, dropping packet.
Networking goes downhill very fast when pptp control connection packets
are rejected by the firewall.
The problem was fixed by increasing the maximum number of connections in
/proc/sys/net/ipv4/ip_conntrack_max from 4096 to 16384.
Hope this helps you.
Greetings,
Peter.
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