Multicast Updates |
On the tab, you can configure updates transmission on workstations via the multicast protocol. Set the flag to enable transmission of updates to stations via the multicast protocol. General principles of multicast updates: 1.If multicast updates are enabled, when for all stations connected to this Server updating is performed in two stages: a)Stations are listening the specified multicast groups into which the Server is included. When multicast updates are ready, stations download them via multicast over UDP. b)After multicast updates are transmitted, the Server sends standard notification to stations about updates to get. All that failed to download via the multicast updates, stations download using a standard TCP update. 2.If multicast updates are disabled, updating of all stations is performed only in general mode—via the TCP protocol. To setup multicast updates, use the following parameters: •—size of UDP datagrams in bytes. Allowed range is 512—8192. To avoid fragmentation, it is recommended to set a value less than MTU (Maximum Transmission Unit) of the network. •—during specified time, single update file is transmitted, after that Server starts sending the next file. All files which failed to transmit at the step of multicast protocol update, will be transmitted at standard update process over the TCP protocol. •—duration of update process via multicast protocol. All files that failed to transmit during update stage via multicast protocol will be transmitted in process of standard update via TCP protocol. •—interval of packages transmission to a multicast group. The low interval value may cause significant losses during package transfer and network overload. It is not recommended to change this parameter. •—with this interval Agents send requests for retransmission of lost packages. Server accumulates these requests after that sends lost blocks. •—when a file transmission is over before allowed time has expired, if during specified “silence” interval no requests from Agents for retransmission of lost packages are received, Server considers that all Agent received updates files and starts sending the next file. •—during specified interval, Server accumulates requests from Agents for retransmission of lost packages. Agent request lost packages. Server accumulates these requests during specified time slot after that sends lost blocks. To specify the list of multicast groups from which multicast updates is available, setup the following parameters in the section: •—IP address of multicast group in which stations receive multicast updates. •—port number of Dr.Web Server network interface, to which transport multicast protocol is bound for updates transmission.
•—Time to live of a datagram for data transfer during multicast updates. •—IP address of Dr.Web Server network interface, to which transport multicast protocol is bound for updates transmission. Every line contains setup of one multicast group. To add one more multicast group, click . When you configure several multicast groups, please note the following features: •For different Dr.Web Servers, which will distribute multicast updates, must be different multicast groups specified. •For different Dr.Web Servers, which will distribute multicast updates, must be different and parameters specified. •For using several multicast groups, sets of stations which are included into these groups must not overlap. Thus, each station of anti-virus network can be included only into one multicast group. In the section, you can configure restrictions for network addresses of stations to which multicast updates can be sent: •Stations that are allowed to receive multicast updates, listen specified multicast groups and receive updates using the standard scheme (see procedure 1). •Stations that are denied to receive multicast updates, do not listen specified multicast groups for updates but download all updates via TCP (see procedure 2). Configuration of the lists is the same as the configuration of the lists in the Security section. |