Difference between revisions of "Ethernet payload datarates"
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* Add 8 Bytes UDP header | * Add 8 Bytes UDP header | ||
* Max UDP Payload data rates over ethernet are thus: | * Max UDP Payload data rates over ethernet are thus: | ||
| − | ** (1500-28)/(38+1500) = 95.7087 % IPv4 | + | ** (1500-'''28''')/(38+1500) = 95.7087 % IPv4 |
| − | ** (1500-28)/(42+1500) = 95.4604 % 802.1q, IPv4 | + | ** (1500-'''28''')/(42+1500) = 95.4604 % 802.1q, IPv4 |
| − | ** (1500-48)/(38+1500) = 94.4083 % IPv6 | + | ** (1500-'''48''')/(38+1500) = 94.4083 % IPv6 |
| − | ** (1500-48)/(42+1500) = 94.1634 % 802.1q, IPv6 | + | ** (1500-'''48''')/(42+1500) = 94.1634 % 802.1q, IPv6 |
N.B. 802.1q describes ethernet traffic behind a router, or in a Vlan. ([http://en.wikipedia.org/wiki/IEEE_802.1Q Wikipedia]) | N.B. 802.1q describes ethernet traffic behind a router, or in a Vlan. ([http://en.wikipedia.org/wiki/IEEE_802.1Q Wikipedia]) | ||
Latest revision as of 22:06, 30 January 2007
TCP over Ethernet:
- Assuming no header compression (e.g. not PPP)
- Add 20 Bytes IPv4 header or 40 Bytes IPv6 header (no options)
- Add 20 Bytes 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 Bytes IPv4 header or 40 Bytes IPv6 header (no options)
- Add 8 Bytes 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
N.B. 802.1q describes ethernet traffic behind a router, or in a Vlan. (Wikipedia)
(Source)
