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Last seen: 10 years 1 month ago
Joined: 05/08/2014
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Multicast TTL setting not being passed or set


We need DDS to be picked up over multiple subnets. I know that the default Multicast TTL setting is 1, which won't alllow this. I found the article here:

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Last seen: 10 years 7 months ago
Joined: 03/22/2011
Posts: 11
setting discovery TTL

Hi all,

We had some TTL problems in our network lately, where some changes in the network caused the TTL that we set for discovery in the QoS to be too low.

I spoke with our network-engineers and they said that they see no reason not to set the TTL to a the max (255).

So I tried to set the discovery-ttl to 255, and then noticed that while discovery messages were sent with that TTL (as could be seen with wireshark) they were never received by any other machine on the network. Reducing the TTL to something smaller, but still large enough did work.

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