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:
  1. block the whole country (using geoiplookup)
  2. block the whole country from downloading iso files
  3. block the list of IPs
  4. 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@centos.org> on behalf of Bogdan-Stefan
Rotariu <bogdan.rotariu@chroot.ro>
Reply to: "Mailing list for CentOS mirrors." <centos-mirror@centos.org>
Date: Monday, 5 October 2020 at 9:30 PM
To: CEDIA FOSS Mirrors <mirror@cedia.org.ec>, "Mailing list for CentOS mirrors."
<centos-mirror@centos.org>
Subject: Re: [CentOS-mirror] [Ticket#2020100504000801] Potential DOS attack
against a mirror

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Hi there,

On Oct 5, 2020, at 20:24, CEDIA FOSS Mirrors via CentOS-mirror
<centos-mirror@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
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