[nos-bbs] bogus converse ip attempt

[ve1jot]

I'd do a security audit if I were you:

  whois 117.112.109.100
% [whois.apnic.net]
% Whois data copyright terms http://www.apnic.net/db/dbcopyright.html

% Information related to '117.112.0.0 - 117.119.255.255'

inetnum:        117.112.0.0 - 117.119.255.255
netname:        BJENET
descr:          Beijing Education Information Network
descr:          Service Center Corporation
descr:          NO.39 Xueyuan Road,Haidian District ,Beijing, PRC
country:        CN
admin-c:        ZM776-AP
tech-c:         BW887-AP
mnt-by:         MAINT-CNNIC-AP
mnt-lower:      MAINT-CNNIC-AP
mnt-irt:        IRT-CNNIC-CN
status:         ALLOCATED PORTABLE
changed:        ipas at cnnic.cn 20141224
source:         APNIC

irt:            IRT-CNNIC-CN
address:        Beijing, China
e-mail:         ipas at cnnic.cn
abuse-mailbox:  ipas at cnnic.cn
admin-c:        IP50-AP
tech-c:         IP50-AP
auth:           # Filtered
remarks:        Please note that CNNIC is not an ISP and is not
remarks:        empowered to investigate complaints of network abuse.
remarks:        Please contact the tech-c or admin-c of the network.
mnt-by:         MAINT-CNNIC-AP
changed:        ipas at cnnic.cn 20110428
source:         APNIC

person:         Xing Yanhong
address:        NO.39 Xueyuan Road,Haidian District ,Beijing, PRC
country:        cn
phone:          +86-010-82364916
fax-no:         +86-010-62308338
e-mail:         XYH at BJEDU.COM.CN
nic-hdl:        BW887-AP
mnt-by:         MAINT-CNNIC-AP
changed:        ipas at cnnic.CN 20141226
source:         APNIC

person:         Dongliang Wang
address:        NO.39 Xueyuan Road,Haidian District ,Beijing, PRC
phone:          +86-010-82364918
fax-no:         +86-010-62308338
country:        cn
e-mail:         wdl at bjedu.com.cn
nic-hdl:        ZM776-AP
mnt-by:         MAINT-CNNIC-AP
changed:        ipas at cnnic.cn 20141226
source:         APNIC