We can confirm being hit by 27.221.66.0/24 pulling the same iso as well. What action was taken to address this by your networks? Thanks, From: CentOS-mirror <centos-mirror-bounces at centos.org> on behalf of Bogdan-Stefan Rotariu <bogdan.rotariu at chroot.ro> Reply to: "Mailing list for CentOS mirrors." <centos-mirror at centos.org> Date: Monday, 5 October 2020 at 9:30 PM To: CEDIA FOSS Mirrors <mirror at cedia.org.ec>, "Mailing list for CentOS mirrors." <centos-mirror at centos.org> Subject: Re: [CentOS-mirror] [Ticket#2020100504000801] Potential DOS attack against a mirror [EXTERNAL EMAIL] This is an external email, please make sure the sender is well known before clicking on any link or opening an attachment, if spam report it to CIRT at afghan-wireless.com Hi there, On Oct 5, 2020, at 20:24, CEDIA FOSS Mirrors via CentOS-mirror <centos-mirror at centos.org> wrote: hi <snip> 112.95.214.226 - China Unicom Guangdong province network 223.88.61.170 - China Mobile Communications Corporation 171.41.7.29 - CHINANET Hubei province network 120.84.10.190 - China Unicom Guangdong province network 27.221.66.104 - China Unicom Shandong province network 27.221.66.105 - China Unicom Shandong province network 112.32.21.93 - China Mobile Communications Corporation 27.221.49.135 - China Unicom Shandong province network Have you noticed that in your mirrors? look for these IP and notice if they have been trying to continously download iso We did encounter the same issues with the same IP addresses and same iso file. Till now I thought it was an isolated issue.. — Bogdan-Stefan Rotariu CTO,Founder Chroot Network SRL WEB: http://www.chroot.ro<http://track.chroot.ro/?a=10395&m=&n=&s=12c000000d625fc&u=http%3a%2f%2fwww.chroot.ro%3futm_source%3d%26utm_medium%3demail%26utm_campaign%3dunspecified&t=&e=contact%40chroot.ro&h=8a6c74da> Phone: +40-731-247-668<tel:+40-731-247-668> Suport tehnic: suport at chroot.ro<mailto:suport at chroot.ro> Suport vanzari: vanzari at chroot.ro<mailto:vanzari at chroot.ro> Contact general: contact at chroot.ro<mailto:contact at chroot.ro>