[asterisk-users] What this attacks means?

Fri May 27 17:28:32 CDT 2016

Hi to everybody

my system is be attack, but I dont know what this means

[May 27 15:12:24] WARNING[26018] chan_skinny.c: Partial data received,
waiting (76 bytes read of 786)
[chan_skinny.c] skinny_session[0][C-00000000] skinny_session:
WARNING[May 27 15:52:32] Asterisk 13.8.0 built by root @ asterisk on a
x86_64 running Linux on 2016-04-04 19:02:51 UTC
[May 27 15:52:32] NOTICE[2306] cdr.c: CDR simple logging enabled.
[May 27 15:52:32] NOTICE[2306] loader.c: 234 modules will be loaded.
[May 27 15:52:32] WARNING[2306] res_phoneprov.c: Unable to find a
valid server address or name.
[May 27 15:52:32] ERROR[2306] ari/config.c: No configured users for ARI
[May 27 15:52:33] NOTICE[2306] chan_skinny.c: Configuring skinny from
skinny.conf
[May 27 15:52:33] WARNING[2306] chan_dahdi.c: Ignoring any changes to
'userbase' (on reload) at line 23.
[May 27 15:52:33] WARNING[2306] chan_dahdi.c: Ignoring any changes to
'vmsecret' (on reload) at line 31.
[May 27 15:52:33] WARNING[2306] chan_dahdi.c: Ignoring any changes to
'hassip' (on reload) at line 35.
[May 27 15:52:33] WARNING[2306] chan_dahdi.c: Ignoring any changes to
'hasiax' (on reload) at line 39.
[May 27 15:52:33] WARNING[2306] chan_dahdi.c: Ignoring any changes to
'hasmanager' (on reload) at line 47.
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! PLEASE NOTE: Setting
'nat' for a peer/user that differs from the  global setting can make
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! the name of that
peer/user discoverable by an attacker. Replies for non-existent
peers/users
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! will be sent to a
different port than replies for an existing peer/user. If at all
possible,
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! use the global 'nat'
setting and do not set 'nat' per peer/user.
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! (config category='132'
global force_rport='No' peer/user force_rport='Yes')
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! PLEASE NOTE: Setting
'nat' for a peer/user that differs from the  global setting can make
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! the name of that
peer/user discoverable by an attacker. Replies for non-existent
peers/users
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! will be sent to a
different port than replies for an existing peer/user. If at all
possible,
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! use the global 'nat'
setting and do not set 'nat' per peer/user.
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! (config category='133'
global force_rport='No' peer/user force_rport='Yes')
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! PLEASE NOTE: Setting
'nat' for a peer/user that differs from the  global setting can make
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! the name of that
peer/user discoverable by an attacker. Replies for non-existent
peers/users
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! will be sent to a
different port than replies for an existing peer/user. If at all
possible,
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! use the global 'nat'
setting and do not set 'nat' per peer/user.
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! (config category='134'
global force_rport='No' peer/user force_rport='Yes')
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! PLEASE NOTE: Setting
'nat' for a peer/user that differs from the  global setting can make
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! the name of that
peer/user discoverable by an attacker. Replies for non-existent
peers/users
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! will be sent to a
different port than replies for an existing peer/user. If at all
possible,
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! use the global 'nat'
setting and do not set 'nat' per peer/user.
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! (config category='135'
global force_rport='No' peer/user force_rport='Yes')
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! PLEASE NOTE: Setting
'nat' for a peer/user that differs from the  global setting can make
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! the name of that
peer/user discoverable by an attacker. Replies for non-existent
peers/users
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! will be sent to a
different port than replies for an existing peer/user. If at all
possible,
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! use the global 'nat'
setting and do not set 'nat' per peer/user.
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! (config category='136'
global force_rport='No' peer/user force_rport='Yes')
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! PLEASE NOTE: Setting
'nat' for a peer/user that differs from the  global setting can make
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! the name of that
peer/user discoverable by an attacker. Replies for non-existent
peers/users
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! will be sent to a
different port than replies for an existing peer/user. If at all
possible,
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! use the global 'nat'
setting and do not set 'nat' per peer/user.
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! (config
category='1000' global force_rport='No' peer/user force_rport='Yes')
[May 27 15:52:33] NOTICE[2306] chan_sip.c: The 'username' field for
sip peers has been deprecated in favor of the term 'defaultuser'
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! PLEASE NOTE: Setting
'nat' for a peer/user that differs from the  global setting can make
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! the name of that
peer/user discoverable by an attacker. Replies for non-existent
peers/users
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! will be sent to a
different port than replies for an existing peer/user. If at all
possible,
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! use the global 'nat'
setting and do not set 'nat' per peer/user.
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! (config
category='1003' global force_rport='No' peer/user force_rport='Yes')
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! PLEASE NOTE: Setting
'nat' for a peer/user that differs from the  global setting can make
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! the name of that
peer/user discoverable by an attacker. Replies for non-existent
peers/users
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! will be sent to a
different port than replies for an existing peer/user. If at all
possible,
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! use the global 'nat'
setting and do not set 'nat' per peer/user.
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! (config
category='2000' global force_rport='No' peer/user force_rport='Yes')
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! PLEASE NOTE: Setting
'nat' for a peer/user that differs from the  global setting can make
[May 27 15:52:33] WARNING[2306] chan_sip.c: !!! the name of that
peer/user discoverable by an attacker. Replies for non-existent
peers/users

What happen with my Asterisk, and how to protect with this?

Thanks.