Linux System Log avahi-daemon[3640]: Invalid query packet.

2014-06-11 Check The Linux system log find the Errorr:

June 9 11:18:49 hostname avahi-daemon[3640]: Invalid query packet.

June 9 11:19:29 Hostnam elast message repeated 7 times
June 9 11:22:06 Hostnam eavahi-daemon[3640]: Invalid query packet.
June 9 11:23:39 hostname last message repeated times
June 9 11:24:19 hostname last message repeated 7 times
June 9 11:27:41 hostname ntpd[3505]: Kernel time sync enabled 4001
June 9 11:29:06 hostname avahi-daemon[3640]: Invalid query packet.
June 9 11:29:46 hostname last message repeated 7 times
June 9 11:34:13 hostname avahi-daemon[3640]: Invalid query packet.

June 9 11:34:53 hostname last message repeated 7 times

Here is a description of the online search:

Avahi-daemon is a service daemon that runs on the client computer on a Linux operating system to find a network-based zeroconf service. The service can implement DNS service discovery and DNS multicast specifications for the ZEROCONF network. The user program receives notifications of discovery of network services and resources through the Linux D-bus information delivery. The daemon works with the cached user program's responses to help reduce network traffic resulting from replies.

Zeroconf

The Zero configuration networking (zeroconf) 0 configures the Network Service specification, which is a network technology for automatic generation of available IP addresses, without the need for additional manual configuration and dedicated configuration servers.

The goal of "0 configuration Network Service" is to make it easy for non-professional users to connect various network devices, such as computers, printers, etc. The whole process of network building is realized through program automation. Without zeroconf, users must manually configure some services, such as DHCP, DNS, other settings for the computer network, and so on. These are difficult things for non-technical users and new users.

The ZEROCONF specification is presented by Apple Inc.

Avahi

Avahi is an open source implementation of the ZEROCONF specification, commonly used on Linux. Contains the implementation of a complete set of multicast DNS (MULTICASTDNS)/DNS-SD network services. The release authorization it uses is LGPL. Another implementation of the ZEROCONF specification is Apple's Bonjour program. Avahi and Bonjour are compatible with each other (nonsense, go with the same standard, just like Ie,firefox,chrome can run HTTP1.1).

Avahi allows programs to publish and learn about various services and hosts on a local network without the need for manual network configuration. For example, when a user connects his computer to a local area network, if his machine is running with a Avahi service, the Avahi program broadcasts automatically, discovering the printers available on the network, sharing files, and other users who can chat with each other. It's kind of like he's receiving all kinds of Internet ads in the LAN.

The process name that the system actually starts under Linux is Avahi-daemon

unless you have a compatible device or a service that uses the ZEROCONF protocol, you should turn it off.  

If you don't use it to turn the service off directly

/etc/init.d/avahi-daemon Stop or service Avahi-daemon stop

to summarize, avahi-daemon the role of this process, but it requires device support to function. Now on our backup server must not be able to use this service function, so, here decisive # service Avahi-daemon Stop # chkconfig Avahi-daemon off!