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<== Date ==> <== Thread ==>

Subject: Need clarification on UDP Broadcasting to multiple IOCs on same PC
From: "Manoussakis, Adamandios via Tech-talk" <tech-talk at aps.anl.gov>
To: tech-talk <tech-talk at aps.anl.gov>
Date: Tue, 7 Dec 2021 18:29:55 +0000

Hello All,

 

I have been trying to understand the UDP broadcast requests when having multiple IOCs running on a single host (ubuntu).  I am using the script from https://wiki-ext.aps.anl.gov/epics/index.php/How_to_Make_Channel_Access_Reach_Multiple_Soft_IOCs_on_a_Linux_Host and the rule is in place on my host:    0     0 DNAT       udp  --  any    any     anywhere             ubuntu               udp dpt:5064 to:192.168.252.255.  My confusion comes from that when I hook up wireshark to my local interface I am seeing traffic from caget requests but don’t seem to see the broadcast going out (192.168.252.255:5064).  The rule seems like any source traffic pointed at my hostname should get funneled to the broadcast address.

 

I am running into an issue with my gateway where the gateway is not able to reach all the IOCs but without the gateway it seems to work with the 10 IOCs I have running.  But now I am not so sure its due to the prerouting rule and might be some other magic happening?

 

Thanks,
Adam 


Replies:
Re: Need clarification on UDP Broadcasting to multiple IOCs on same PC Ralph Lange via Tech-talk

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