Author Topic: udp multicast igmp  (Read 5892 times)

peter

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udp multicast igmp
« on: March 02, 2015, 02:14:06 AM »
Case 1:

We have developed application with udp, multicast and igmp.

Udp server sends a file snapshot every 0.3 second to clients because the content of the file changes constantly.  The file snapshot is complete file, not the difference.

Question:

Would  wanos appliance handle above case and give optimization ?

Case 2:
Based on case 1, we are currently (still under developing stage) trying to send compressed complete snapshot in order to save the bandwidth.

Question:
Would wanos appliance handle case 2 and give optimization ?

Thanks


ahenning

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Re: udp multicast igmp
« Reply #1 on: March 02, 2015, 08:04:26 AM »
Hi Peter,

Assuming all configurations and checks are done,  then both cases could work, although the multicast traffic might make MultiSite a challenge.

Case 1 ) depending on the type of changes to the file (we can perhaps compare the two files) dedup should work well in this case. Compression will also have a chance to compress the stream.

Case 2 ) Depending on the size of file and how the changes are made, dedup might still be able to work e.g. Zlib buffer size is about 32K, depending how the changes affect the zip file, it is still possible for dedup to work on the unchanged data if zipped segments compress exactly the same. The chances that dedup will work efficiently is much lower. Depending on the compression used, wanos compression will be 0 to minimal.

Potential problems:
UDP needs to be configured very specifically: e.g. source and destination address
Since its Multicast, only the source ip is available.
Multicast destination address is going to confuse MultiSite.
Need to check the MTU of the server to avoid fragmentation.
« Last Edit: March 02, 2015, 09:00:45 AM by ahenning »
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peter

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Re: udp multicast igmp
« Reply #2 on: March 02, 2015, 03:35:28 PM »
"Need to check the MTU of the server to avoid fragmentation"
I do not catch you over here, please explain it a bit more.

Thanks

ahenning

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Re: udp multicast igmp
« Reply #3 on: March 02, 2015, 03:48:55 PM »
Optimization has additional overhead per packet. To ensure UDP optimization work reliably it would be good to configure the Server MTU lower to ensure when it sends UDP packets, enough head room is available for optimization.
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peter

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Re: udp multicast igmp
« Reply #4 on: March 03, 2015, 12:55:55 PM »
"UDP needs to be configured very specifically: e.g. source and destination address"

I am confused.  TCP optimization initial connection is done by putting probe ins
ide three-way-handshake.

How does UDP do ? Putting two sites' IP address on policy field on both wanos appliances,  then starting udp transmission ? Or something else ?

Pls help

Thanks

ahenning

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Re: udp multicast igmp
« Reply #5 on: March 03, 2015, 06:34:36 PM »
Hi Peter,

It will just work, that is why it needs to be carefully considered and configured. In other words to be sure only the UDP traffic that is intended to be optimized, gets optimized.

Best to test, but if multicast means wanos is going get 239.x destination addresses, then MultiSite is going to be a bit tricky.
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peter

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Re: udp multicast igmp
« Reply #6 on: March 05, 2015, 05:23:39 AM »
" Best to test, but if multicast means wanos is going get 239.x destination addresses, then MultiSite is going to be a bit tricky. "

Why?  In this case,  does  not wanos do optimization based on the policy, ( over here is preset source ip and destination ip for udp ) . As long as, my guessing,   wanos sees a udp packet with source ip and destination 239.x, it starts reducing packet at server side and restoring packet at client side because the policy is there already.  Or internal design is some different?  Pls help.
« Last Edit: March 05, 2015, 08:41:58 AM by peter »

ahenning

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Re: udp multicast igmp
« Reply #7 on: March 05, 2015, 10:31:43 AM »
Yes the internal design is different. By default udp multicast optimization is only compatible in single site point to point cases.
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