my BIND 9.10.3 is logging strange entries like:
Jan 12 12:44:49 www named[24776]: client 117.136.25.126#18977: message parsing failed: FORMERR
Jan 12 12:50:47 www named[24776]: client 117.136.25.126#18978: message parsing failed: FORMERR
Jan 12 13:00:08 www named[24776]: client 117.136.95.15#24805: message parsing failed: FORMERR
117.136.95.15 is not in my network, and I don't allow recursion for anything but localhost, thus it must be for a zone I'm authoritative for.
This only started recently (Jan 5th). Looking at the log it seems, that only queries from:
# zfgrep "message parsing failed: FORMERR" daemon.log* | awk '{print $7}' |awk -F\. '{printf("%s.%s.x.x\n",$1,$2)}' | sort | uniq -c | sort -n
1 101.27.x.x
1 121.31.x.x
1 1.84.x.x
1 61.158.x.x
104 223.104.x.x
150 117.136.x.x
are causing this. Looking at the WHOIS info for those IPs:
inetnum: 117.128.0.0 - 117.191.255.255
netname: CMNET
descr: China Mobile Communications Corporation
descr: Mobile Communications Network Operator in China
descr: Internet Service Provider in China
country: CN
inetnum: 223.64.0.0 - 223.117.255.255
netname: CMNET
descr: China Mobile Communications Corporation
descr: Mobile Communications Network Operator in China
descr: Internet Service Provider in China
country: CN