Just a few minutes ago I was experiencing a very slow internet connection. My download speed was just 1.4 kb/s - way to slow. I looked at my router's log page and found an entry indicating a DoS attack - SYN FLOOD!!.. A already enabled DoS prevention option from my router so I shouldn't be that affected, well it sure is slowing my connection. After a few tweaks, I looked at my WAN settings and decided to also disable WAN pinging. I wasn't even contented and had all other services and firewall exceptions as well as virtual servers in my router disabled and it did the trick.. Now I'm enjoying an average of 80 kb/s download. My router is D-Link DI-524 firmware version 2.05. It was originally at version 2.03 but 2.03's don't have this option (DoS attack prevetion), so I upgraded my it to 2.05.

Instructions are here:

1. Launch internet explorer or my computer any type in the address 192.168.0.1, type your username and password.
   
2. Select the Tools tab and enable Discard PING from WAN side.
3. Also enable DoS Protection option.
4. I also forced my WAN select to 10/100 Mbps option to 100 Mbps/Full.
5. From the Advanced tab, Virtual Server option, I disabled all virtual servers except the ones I knowingly allowed.

 

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