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A comment on A Linux botnet is launching crippling DDoS attacks in excess of 150Gbps. Parent comment

Re:A Linux botnet is launching crippling DDoS attacks in exc... by broodbucket on Wednesday September 30, 2015 @03:21AM (#10302305)
Is this on a well-known cloud hosting provider? I assume so, unless "s3" indicates something else.

There have been attacks against known cloud hosting IP ranges for a long time. I'm constantly getting attempts on my personal server on common ports (i.e. 3128 for a proxy to spam through), that's on DigitalOcean.

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Re:A Linux botnet is launching crippling DDoS attacks in exc... by Animats on Wednesday September 30, 2015 @03:32AM (#10302339)
No, it's just the third server of a set, a leased dedicated bare metal CentOS server in a large data center in Phoenix AZ. No "cloud" service is involved.

This has been going on for about three weeks now. I may configure PAM to force a login delay; the logs are getting big.

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Re:A Linux botnet is launching crippling DDoS attacks in exc... by keeperofdakeys on Wednesday September 30, 2015 @04:35AM (#10302535)
While it doesn't give any real security, changing the ssh port will at least filter out these kinds of attacks.
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Re:A Linux botnet is launching crippling DDoS attacks in exc... by voltagex_ on Wednesday September 30, 2015 @03:48AM (#10302397)
Would you consider fail2ban in this case?
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Re:A Linux botnet is launching crippling DDoS attacks in exc... by msl09 on Wednesday September 30, 2015 @08:19AM (#10303336)
"Warning: Using an IP blacklist will stop trivial attacks but it relies on an additional daemon and successful logging (the partition containing /var can become full, especially if an attacker is pounding on the server). Additionally, if the attacker knows your IP address, they can send packets with a spoofed source header and get you locked out of the server. SSH keys provide an elegant solution to the problem of brute forcing without these problems."

source: https://wiki.archlinux.org/index.php/Fail2ban

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Re:A Linux botnet is launching crippling DDoS attacks in exc... by justinsaccount on Wednesday September 30, 2015 @09:19AM (#10303671)
> Additionally, if the attacker knows your IP address, they can send packets with a spoofed source header and get you locked out of the server.

No they can't. That is not how TCP works.

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Re:A Linux botnet is launching crippling DDoS attacks in exc... by voltagex_ on Wednesday September 30, 2015 @10:24AM (#10304167)
From memory, you can spoof UDP but not TCP.

https://serverfault.com/a/153619/91708

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