Reviews:
 ·voip.ms
| This is business I see two problems with this:
1) Don't forget that IPv6 is adding more overhead. If your ISP has a bandwidth cap that means you get less payload. First they have ~15% PPPoE overhead, then they count 1Gig as 1000Megs (not 1024), and now this IPv6 that will steal even more from 60GB/month pool. What the hell is going on???
2) Regarding router firmwares - it's good if you have a Linux/BSD router, where you just download a newer version. If you have a crappy D-Link/SMC router - no firmware updates for that. They just want you to toss it and buy a new one. Similar to how people upgraded from Win98 to WinME just to avoid Y2K problem, which was stupid to begin with. But hey, this is business. |
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| The IPv6 header can be smaller then the IPv4 header. |
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| While i think 20byets a packet extra isn't going to make that big of a deal, I cant see where IPv6 packet are ever smaller then IPv6 everything I read says 40bytes vs 20bytes minimum. |
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patcat88
join:2002-04-05
Jamaica, NY
kudos:1
1 edit | reply to dan1rulz
said by dan1rulz:The IPv6 header can be smaller then the IPv4 header. Irrelevant, the mandatory IPSec encryption with all IPv6 connections is going to waste twhrs of power on fixed and mobile equipment, killing battery life, killing performance/CPU capacity that could be used for something better. The whole purpose of UDP just went to hell if you have to do key exchange for every connection. |
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| reply to Napsterbater
IPv4 ranges from 20-60 bytes depending on the options field. IPv6 is fixed at 40. |
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Reviews:
·VOIPo
 ·Windstream
·BroadVoice
| But options are set as extensions they are just not in the "header", so there still there taking up space thus overhead.
From »sd.wareonearth.com/~phil/net/overhead/
quote:
TCP over Ethernet:
Assuming no header compression (e.g. not PPP)
Add 20 IPv4 header or 40 IPv6 header (no options)
Add 20 TCP header
Add 12 bytes optional TCP timestamps
Max TCP Payload data rates over ethernet are thus:
(1500-40)/(38+1500) = 94.9285 % IPv4, minimal headers
(1500-52)/(38+1500) = 94.1482 % IPv4, TCP timestamps
(1500-52)/(42+1500) = 93.9040 % 802.1q, IPv4, TCP timestamps
(1500-60)/(38+1500) = 93.6281 % IPv6, minimal headers
(1500-72)/(38+1500) = 92.8479 % IPv6, TCP timestamps
(1500-72)/(42+1500) = 92.6070 % 802.1q, IPv6, ICP timestamps
UDP over Ethernet:
Add 20 IPv4 header or 40 IPv6 header (no options)
Add 8 UDP header
Max UDP Payload data rates over ethernet are thus:
(1500-28)/(38+1500) = 95.7087 % IPv4
(1500-28)/(42+1500) = 95.4604 % 802.1q, IPv4
(1500-48)/(38+1500) = 94.4083 % IPv6
(1500-48)/(42+1500) = 94.1634 % 802.1q, IPv6
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| reply to patcat88
IPsec dose not have to be turned on it just has to be supported.
There is nothing saying every connection must have IPsec on encrypting everything.. |
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