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Old 11-20-2013, 02:14 PM
Pericynthion Pericynthion is offline
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Default 'Enable HW Accelerator' - affecting local LAN/WIFI traffic (breaks PS4 Remoteplayetc

Does anyone know exactly how the 'Enable HW Accelerator' option (under the 'LAN' tab comes into play?

From reading the other threads, I was under the impression that the option primarily provides some advanced cut-through/cache type switching functions to minimize kernel level inspection of traffic moving *between the LAN/WAN*. Obviously it has to be disabled for things like QOS because it now has to go through kernel level inspection for rule matching etc.

What I cant figure out is why this option seems to be interfering with local LAN clients - in my case a 2.4Ghz wireless client (PS Vita) to a wired client (PS4). With the accelerator option enabled it experiences persistent timeouts, drops connections etc - but when I explicitly disable it, everything runs without a hitch.

Theres no traffic (from what I can see with wireshark) that is leaving the local wifi->LAN switch subnets, so I'm curious about where it comes into play - ie. is it route based, or is it always coming into play between virtual switches (i.e. between wifi and LAN, LAN and WAN, wifi and WAN - but not between LAN-LAN, wifi-wifi etc).

Last edited by Pericynthion; 11-20-2013 at 02:27 PM.
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Old 11-20-2013, 02:58 PM
bluepoint bluepoint is online now
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Somebody might be able to help you if you describe your router and what firmware it is using..
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Old 11-20-2013, 04:31 PM
Pericynthion Pericynthion is offline
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Default 'Enable HW Accelerator' - affecting local LAN/WIFI traffic (breaks PS4 Remote...

Sorry - it wasn't router specific. This relates to both RT-N66U and RT-AC66U running latest ASUS and Merlin firmwares.

It was more a specific question about whether the hardware acceleration is specifically between LAN+WAN or between any virtual 'bridges' (so WIFI->LAN, LAN-WAN etc).

From my testing it appears to be between all of them, so am curious what it is doing (and if I can disable it for say the local vlans for wired and wireless, but keep it on for wan side traffic)
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Last edited by Pericynthion; 11-20-2013 at 05:17 PM.
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Old 11-20-2013, 06:38 PM
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Since CTF is closed-source, nobody but Broadcom knows exactly what it does and how it works. We know some bits about it from observations various persons made over the years, but nothing complete unfortunately.
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Old 11-21-2013, 02:53 AM
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Im not sure how it works but after a lot of testing I can guarantee that AIRPLAY is much more stable when HW accelerator is DISABLED - So some packages might be lost?

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