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Jumbo frames in a wireless environment

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scottyja

Occasional Visitor
I just purchased a DLink DNS-323 and it should arrive next week. Regarding Jumbo frames, is enabling this going to cause a problem if accessing the NAS wirelessly? I have a Gigabit router connected to an office desktop and a HTPC, and both have jumbo support enabled. My 2 laptops have jumbo support when connected to the LAN. What about when connected wirelessly? Will frames get dropped? The wireless router (WRT54g) is connected directly to the gigabit router.
 
The notebooks will be talking to the AP inside the router, which has its own switch port and will properly handle the packets.
 
The notebooks will be talking to the AP inside the router, which has its own switch port and will properly handle the packets.

So this is different than if one of the computers connected to the LAN didn't have jumbo frames enabled? I guess I'm a little unclear on when/where you can run into problems have jumbo frames enabled.
 
I just purchased a DLink DNS-323 and it should arrive next week. Regarding Jumbo frames, is enabling this going to cause a problem if accessing the NAS wirelessly? I have a Gigabit router connected to an office desktop and a HTPC, and both have jumbo support enabled. My 2 laptops have jumbo support when connected to the LAN. What about when connected wirelessly? Will frames get dropped? The wireless router (WRT54g) is connected directly to the gigabit router.

AFAIK, the WRT54G cannot handle jumbo frames, so it if saw one, it would just drop it. However, TCP handles this issue generally, in the MSS exchange at the beginning of each conversation. The wireless would announce a non-jumbo MSS, and the other side, the DSN-323, would respond accordingly, and not transmit jumbo frames for that conversation.

UDP does not have a MSS exchange, so UDP transfers with the DNS-323 (media streaming?) could have issues if the application tried to use jumbo frames. Hopefully, the odds of this happening are low. If it does happen though, it's likely to not be very subtle, and you could diagnose / work around it by disabling jumbo frames.
 

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