10/05/2020 12:40 - Thomas Enos wrote: 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? hi Thomas there are several approaches that could be taken: - block the whole country (using geoiplookup) - block the whole country from downloading iso files - block the list of IPs - If the attacks persist from other IPs, then it is advisable to create a list of IPs we can use here to share IPs trying to dos our mirrors. This way everybody could use the list to block connections from them. other suggestions are welcome regards epe 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: [1]http://www.chroot.ro<[2]http://track.chroot.ro/?a=10395&m=&n=&s=12c000000d625fc&u=http%3a%2f%2fwww.[..]> 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> [1] http://www.chroot.ro [2] 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos-mirror/attachments/20201005/e6a547a8/attachment-0003.html>