How much damage did you incur in your ranking/indexing?

I'd just wait.

I have tenthousends of keywords - too much too control by hand. I'll get an overview only once per week at sunday when I see my overall visibility. Than I'll see the damage in ranking.

Also in the moment I'm still under attack. Therefore, I'm still busy with blocking and keep the service alive.

I also had to change my IP, but I hope that this doesn't play a role.

My advice is to be careful with the next steps.

We had a similar experience with a series of ddos attacks. We were ok with that even when the site went down.

What hurt us with Google was the increase in authorization errors we got after putting password protection in our login pages [webmasterworld.com...] sometime in June. Google traffic went downhill after that. Even after we have removed password protection, traffic just went sliding down, down and down with Dec our lowest point.

We are now up more than 100% from our lowest point last year, but still a lot way off from our traffic before the attacks.

So just be careful on what you implement next to protect your site. To this day, I still can't understand why Google would react that way to putting password protection to our login pages, but they did -- and we got severely hit in the process.

Thanks for the advice.

Anyway in my case all traffic is just for the homepage, no other page. Therefore, there is nothing to protect or any other way to avoid traffic apart from blocking IPs and blocking countries. So far I've blocked about 20 coutries plus thousands of IPs. It's hard to get rid of that attack even with professional help.

doc_z
I suggest that you start a thread about this in the WebmasterWorld Search Engine Spider and User Agent Identification Forum
[webmasterworld.com ]
There are some real experts there who might be able to help you improve your defenses against this.

thousands of IPs

You're cutting your slivers too small.