Hi
Sorry for my ignorance but I've been looking in this firmware talked about from Johnson. I can see a main benefit being these Baby jumbo frames which I also looked up and found a great explanation of how it works from Weaver. However I don't understand what the benefits of this system? Why does it matter if it's 8 bytes more? What exactly will this get me?
Thanks!
It is not going to make any noticeable difference. To explain it using an analogy:
You use a delivery company that has a maximum weight limit for each package of 1500 grams, and all the companies they use also in the process of moving the parcels also have the same weight limit. Now lets assume your labelling and other documentation always weighs 8 grams. When the package gets to the delivery company, it weights in at 1508 grams, over their very strict weight limit. They give you two options now, either send it back to you because it is over their weight limit and you repackage it, or they separate the package into two parcels, causing a delay and potentially breaking the contents! Clearly neither is ideal. So the solution is to make sure when you send packages out, you work on the basis the packet itself must weigh no more than 1492 grams, so that when your labelling is added it never exceeds 1500 grams.
The irony is, the delivery company removes your labelling and replace it with an electronic barcode with no weight, so what leaves them only weighs 1492 grams, i.e. you could be sending an extra 8 grams of goods for the same price.
Baby jumbo frames is the equivalent of organising with the delivery company to change their process, rather than reject the parcel over 1500 grams, they allow you to deliver to them parcels up to 1508 grams. They except these slight heavier parcels, and it causes no problems elsewhere as when they remove your labelling, the weight is 1500 grams, and everyone is happy.
Now the above is only going to make a difference if every time you send a parcel it is always 1500 grams in weight, if most of your parcels are well under the weight limit anyway, that arrangement doesn't give you any benefit.
This is why adding an extra 8 bytes to the packets you send will not see much difference, if any at all. Of course some of us like to optimise everything to the absolute maximum. Networks tend to work on the basis of 1500 bytes being the maximum packet size, the reason we sometimes have a 1492 limit therefore is because of the way we first need to deliver the packets from our modems to the first drop, as there is an additional 8 bytes of address data, which gets removed when those packets go onto the internet. Jumbo packets is a sort of stretching of the specification we do locally, this is why it is often not supported or requires a bit of messing round to do, because it is out of the ordinary.
Regards
Phil