[clug-talk] Synflood attacks

2013-08-21 Thread Hendrik Schaink
I am getting a lot of probes on my firewall that are internally reported as Blocked Synflood, cleverly crafted to appear as coming from a number of IP addresses onto a select few ports. Assuming the IP addresses are all fake and Shaw does not have any incentive to track down the sources, how would

Re: [clug-talk] Synflood attacks

2013-08-21 Thread John Jardine
Hi Hendrik, If there is no attempt to continue the TCP handshake then you may be getting some kind of DoS attack, if not I wouldn't assume the IP addresses are faked otherwise the connection won't work. The scale (number of SYN/second) will tell you if this is real or just an artifact of somethin