Is there some way of using something like IPTABLES to block if it sees a certain amount of connections from a particualar IP? I know Ciphertrust Ironmail does this. On 11/1/05, Steven Jones <Steven.Jones@xxxxxxxxx> wrote: > > Sendmail has some protection in terms of load limiting, these are a bit > high so you can set them lower so the server recovers sooner. This will > save your server but in effect it allows DoS sooner. > > Possibly you do not understand what a DoS is. DoS is a function of your > attacker overloading your network or server's capacity to handle network > traffic sent at it. > > These days unless you are a big organisation with huge pipes, big > multiple servers and deep pockets, and someone wants you dead, your > dead. > > If someone wants to take your server out they can, it is simply a matter > of logistics, they control 30 or 300 or 3000 or 30000 spam drones of > hacked broadband connections and the volume these generate is amazing. > > I was Dos'd a while back, I was sent 5+gig of volume in 2~3 minutes, my > 512k cable modem could not cope so in effect the DoS happened at the > ISP's end of my pipe, totally outside of my control. > > Modern machines, even desktop ones should be able to handle a lot of > mail, if you are having issues with DoS's then maybe it is something > else. > > Regards > > Thing > > > > -----Original Message----- > From: Devon Harding [mailto:devonharding@xxxxxxxxx] > Sent: Wednesday, 2 November 2005 10:43 a.m. > To: General Red Hat Linux discussion list > Subject: Protect sendmail from DoS > > How can I protect my sendmail server against DoS attacks? > -- > redhat-list mailing list > unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=subscribe > https://www.redhat.com/mailman/listinfo/redhat-list > > > -- > redhat-list mailing list > unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe > https://www.redhat.com/mailman/listinfo/redhat-list > -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subjecthttps://www.redhat.com/mailman/listinfo/redhat-list
