nanog mailing list archives
Re: What are these Google IPs hammering on my DNS server?
From: "John R. Levine" <johnl () iecc com>
Date: 3 Dec 2023 14:07:35 -0500
They are probably spoofed IPs. So those are the target IP IPs of a DDoS What king of amplification factor does your DNS server have? I bet with the changes you’ve made, it’s super high. People are looking for DNS servers like that.
On the contrary, the reponse packets are tiny.
$ host -t txt comcast.net.contacts.abuse.net comcast.net.contacts.abuse.net descriptive text "abuse () comcast net" $ host -t hinfo comcast.net.contacts.abuse.net comcast.net.contacts.abuse.net host information "lookup" "comcast.net"
Those reply packets are 108 and 109 bytes, no addditional section, no DNSSSEC, no nothing.
Any other ideas? One clue is that the queries have random capitalization which would be consistent with them really coming from Google.
Every once in a while someone decides to look up every domain in the world and DoS'es it until I update my packet filters. This week it's been this set of IPs that belong to Google. I don't think they're 8.8.8.8. Any idea what they are? Random Google Cloud customers? A secret DNS mapping project? 172.253.1.133 172.253.206.36 172.253.1.130 172.253.206.37 172.253.13.196 172.253.255.36 172.253.13.197 172.253.1.131 172.253.255.35 172.253.255.37 172.253.1.132 172.253.13.193 172.253.1.129 172.253.255.33 172.253.206.35 172.253.255.34 172.253.206.33 172.253.206.34 172.253.13.194 172.253.13.195 172.71.125.63 172.71.117.60 172.71.133.51
Current thread:
- What are these Google IPs hammering on my DNS server? John Levine (Dec 03)
- Re: What are these Google IPs hammering on my DNS server? Mike Hammett (Dec 03)
- Re: What are these Google IPs hammering on my DNS server? Tom Samplonius (Dec 03)
- Re: What are these Google IPs hammering on my DNS server? John R. Levine (Dec 03)
- Re: What are these Google IPs hammering on my DNS server? Peter Potvin via NANOG (Dec 03)
- Re: What are these Google IPs hammering on my DNS server? John R. Levine (Dec 03)
- RE: What are these Google IPs hammering on my DNS server? Michael Hare via NANOG (Dec 03)
- RE: What are these Google IPs hammering on my DNS server? John R. Levine (Dec 03)
- Re: What are these Google IPs hammering on my DNS server? Mark Andrews (Dec 03)
- Re: What are these Google IPs hammering on my DNS server? John R. Levine (Dec 03)
- Re: What are these Google IPs hammering on my DNS server? Damian Menscher via NANOG (Dec 04)
- Re: What are these Google IPs hammering on my DNS server? John R. Levine (Dec 04)
- RE: What are these Google IPs hammering on my DNS server? Michael Hare via NANOG (Dec 05)
- Re: What are these Google IPs hammering on my DNS server? Ray Bellis (Dec 05)
- Re: What are these Google IPs hammering on my DNS server? John R. Levine (Dec 03)