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Slow Wifi behind a RED 50

Hi everybody,

we just got a new Sophos XGS2300 with SFOS 18.5.1 MR-1-Build326. We are using the APX320 Access Points.

Wifi at our Headquarter works fine. 2 Guests networks in seperate zone and one bridged to AP LAN.

At our branch offices, all connected via RED 50 the 2 wifi guest networks are horrible slow and unusable. The bridged to AP LAN wifi is OK.

I´ve read several threads about slow wifi in seperate zone mode. TCP segmentation is off. Advanced Threat Protection is also off.

For testing I´ve created 2 new seperate Zone wifi´s with MTU 1100 for the branch offices.
This works fine for browsing the web but some services just dont work with this settings, like Skype or the apple App Store.

Any suggestions on this behavior?

Thanks in advance.
Kind Regards
Tobias



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