Axiom Home Page Forums General Discussion Home Theater For you Denon 3808 users who can't update the FW.

OK, I just looked at the trace of 3808 doing a FW update check.

The IP stack actually starts out with a TTL (time to live) of 30. So here's how you can tell if your Denon update will work or not.

If you traceroute to 202.218.213.57 (the address in the packet trace) and you are more than 30 hops away, you will not be able to perform the update.

One more thing, they use a tcp window size of 8192. That's pretty small. Granted it's an AVR but still! The couldn't devote 16K to TCP so the update can happen twice as fast?


UPdate: I just tried to perform a traceroute. Some idiot ISP decided to block ICMP messages so you won't get that far. Oh well. But it does get you close enough to see how much wiggle room you have. When I did the traceroute, I got up to 23 hops. Since my update works, the denon's server's IP can't be more the 6 hops away from the the idiot ISP blocking the ICMPs.

wow...

I didn't understand one word of that. Fortunately I don't have a 3808.

Homedad, it's about the age-old tale of the kid of has to trace his route back in the forest, but he only has 30 white stones. So, if the 38 and 08 parents are losing them in the forest too far, they will not be able to find their way back to the Upgrade Cottage when they used to live (before they moved to a USB2.0 Hotel).

Not a bad analogy for getting the message across. But to be more specific, every packet on the Internet has a Time-to-live field. Every router will reduce it by one as the packet traverses the router. This is call "decrementing the TTL." Some home routers *don't* do this so the ISP can't pick up that you have a "router" Anyway, after 30 routers, the TTL will be zero. At that point, the router drops the packet and sends "TTL Expired in Transit" message to the original sender. This is in place so packets won't live forever on the Internet (if you have a loop for example).

Puppies are soooo cute.







i.e. : huh?

I actually thought Hansang's explanation was pretty clear. (the second one.. the first one had me scratching my head a bit)

All made sense to me.