Hello,

We also had a similar issue in 2019

May 2019 6768.16 GB

Jun 2019 4571.42 GB

Jul 2019 5033308.72 GB

Aug 2019 1665015.47 GB

Sep 2019 480864.23 GB

Oct 2019 7492.56 GB

All of the increase in traffic was China networks.

In my case we waited it out and still have about 50% over normal from China.

We were wondering what CentOS’ position on geoblocking is?

Good day,

Didier

Didier Aeschimann
Calgah Computer Systems Ltd. / IT Security Division
1405 Henri-Bourassa E.
Montreal, Quebec, Canada H2C 1H1
Tel:(514) 335 0405 Fax. (514) 335 6541
Email: nospam@redwarning.com, didier@calgah.com
http://www.calgah.com

From: CentOS-mirror <centos-mirror-bounces@centos.org> On Behalf Of Cihan Nimsi via CentOS-mirror
Sent: October-06-20 09:23
To: centos-mirror@centos.org
Subject: Re: [CentOS-mirror] [Ticket#2020100504000801] Potential DOS attack against a mirror

Hello,

We also had the same problem and blocked China. Problem solved.

6.10.2020 01:23 tarihinde Christopher Hawker yazdı:

Hi Thomas,

You could simply use GeoIP Blocking to filter out any traffic from China. Here's a link to achieve this for Apache: https://www.cloudibee.com/geoip-based-country-blocking-for-apache/.

Regards,
Christopher Hawker

From: CentOS-mirror <centos-mirror-bounces@centos.org> on behalf of Thomas Enos <thomas.enos@afghan-wireless.com>
Sent: Tuesday, 6 October 2020 4:34 AM
To: Mailing list for CentOS mirrors. <centos-mirror@centos.org>; CEDIA FOSS Mirrors <mirror@cedia.org.ec>
Subject: Re: [CentOS-mirror] [Ticket#2020100504000801] Potential DOS attack against a mirror

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@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

[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@afghan-wireless.com

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
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>
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Contact general: contact@chroot.ro<mailto:contact@chroot.ro>

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İyi Çalışmalar / Best Regards,

Cihan Nimsi

C-Level Executive

İçerenköy Mh. Ertaç Sk. Ardil İş Merkezi

No: 4/2 Kat: 1 Ataşehir/İSTANBUL

Telefon +90 850 885 0 558 - 1001

www.guzel.net.tr

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