As indicated in:
https://www.linuxquestions.org/questions/linux-newbie-8/there-are-many-query-this-website-on-my-dns-server-4175676097/
The solution is to Include the following lines in '/usr/local/csf/bin/csfpre.sh' file:
iptables -A INPUT -p udp --dport 53 -m string --algo kmp --string "pizzaseo" -j DROP
iptables -A INPUT -p udp --dport 53 -m string --algo kmp --from 0x38 --hex-string "|0000ff00010000292328000000000000|" -j DROP
And restart csf/lfd:
csf -x; csf -e
Regards,
Netino
First, Thank You for your Know How !!!
We apply your solve, but We have anothers stranges lines:
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './NS/IN': 2001:500:12::d0d#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './DNSKEY/IN': 2001:7fd::1#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './NS/IN': 2001:7fd::1#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './DNSKEY/IN': 2001:503:ba3e::2:30#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './NS/IN': 2001:503:ba3e::2:30#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './DNSKEY/IN': 2001:dc3::35#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './NS/IN': 2001:dc3::35#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './DNSKEY/IN': 2001:7fe::53#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './NS/IN': 2001:7fe::53#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './DNSKEY/IN': 2001:500:200::b#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './NS/IN': 2001:500:200::b#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './DNSKEY/IN': 2001:503:c27::2:30#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './NS/IN': 2001:503:c27::2:30#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './DNSKEY/IN': 2001:500:1::53#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './NS/IN': 2001:500:1::53#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './DNSKEY/IN': 2001:500:2::c#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './NS/IN': 2001:500:2::c#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './DNSKEY/IN': 2001:500:2d::d#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './NS/IN': 2001:500:2d::d#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './DNSKEY/IN': 2001:500:a8::e#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './NS/IN': 2001:500:a8::e#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './DNSKEY/IN': 2001:500:2f::f#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './NS/IN': 2001:500:2f::f#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './DNSKEY/IN': 2001:500:9f::42#53
Aug 24 01:26:50 server8.serversweb.net named[32229]: network unreachable resolving './NS/IN': 2001:500:9f::42#53
Does anyone know how to block them?
I'm going to clear the server cache, hope that helps ...