Regarding Multiple Multicast Subnet|OPC UA Standard|Forum|OPC Foundation

Avatar
Search
Forum Scope


Match



Forum Options



Minimum search word length is 3 characters - maximum search word length is 84 characters
Lost password?
sp_Feed sp_PrintTopic sp_TopicIcon
Regarding Multiple Multicast Subnet
Avatar
Rakshan Premsagar Kapikad
Member
Members
Forum Posts: 25
Member Since:
04/29/2019
sp_UserOfflineSmall Offline
1
12/07/2020 - 01:33
sp_Permalink sp_Print

Hello,

In part 12, fig 9, a diagram of multiple multicast subnet architecture is described. Here, it is said that there are multiple subnets, and if clients want to access a remote server/LDS, it should construct the URL by out of band mechanism.

In the diagram, they show a client trying to access the remote LDS-ME.( This means it is across networks right?). The findServersOnNetwork on both sides of yield different results? Could you please tell me, how is that?

 

Regards,

Rakshan

Avatar
Randy Armstrong
Admin
Forum Posts: 1564
Member Since:
05/30/2017
sp_UserOnlineSmall Online
2
12/07/2020 - 19:49
sp_Permalink sp_Print

mDNS connects all LDSes on a network that allows multicast packets. Routers will often block these packets from propagating which means the only way for a Client outside of the network scope to see the results of a mDNS query is to connect to a Server that is physically on the network. The net result is LDS on physically distinct networks will return different results but all LDS on the same network return the same results.

Forum Timezone: America/Phoenix
Most Users Ever Online: 510
Currently Online: Randy Armstrong (Sparhawk), Randy Armstrong, rajesh r_1
Guest(s) 30
Currently Browsing this Page:
1 Guest(s)
Top Posters:
Forum Stats:
Groups: 2
Forums: 10
Topics: 1435
Posts: 4855