Hi,
Danke für die Antworten. Das hat mir doch schon geholfen.
Leider ist das mit den MTU bei mir nicht so einfach. Benutze einen Mac. Da gibt es so ein Tool nicht direkt...
So siehts bei mir aus...
« SpeedGuide.net TCP Analyzer Results »
Tested on: 09.10.2010 17:47
IP address: 91.7.xxx.xxx
Client OS: Mac OS
TCP options string: 020405ac010303030101080a1391b9420000000004020000
MSS: 1452
MTU: 1492
TCP Window: 524280 (NOT multiple of MSS)
RWIN Scaling: 3 bits (2^3=8)
Unscaled RWIN : 65535
Recommended RWINs: 63888, 127776, 255552, 511104, 1022208
BDP limit (200ms): 20971kbps (2621KBytes/s)
BDP limit (500ms): 8388kbps (1049KBytes/s)
MTU Discovery: ON
TTL: 51
Timestamps: ON
SACKs: ON
IP ToS: 00000000 (0)
Und in der lang-Version
MTU = 1492
MTU is optimized for PPoE DSL broadband. If not, consider raising MTU to 1500 for optimal throughput.
MSS = 1452
MSS is optimized for PPPoE DSL broadband. If not, consider raising your MTU value.
Default TCP Receive Window (RWIN) = 524280
RWIN Scaling (RFC1323) = 3 bits (scale factor: 2^3=8)
Unscaled TCP Receive Window = 65535
For optimum performance, consider changing RWIN to a multiple of MSS.
Other RWIN values that might work well with your current MTU/MSS:
63888 (up to 2 Mbit lines, depending on latency. MSS * 44)
127776 (1-5 Mbit lines, depending on latency. MSS * 44 * 2)
255552 (2-14 Mbit lines, depending on latency. MSS * 44 * 2^2)
511104 (8-30 Mbit lines, depending on latency. MSS * 44 * 2^3)
1022208 (25-60 Mbit lines depending on latency. MSS * 44 * 2^4)
bandwidth * delay product (Note this is not a speed test):
Your TCP Window limits you to: 20971 kbps (2621 KBytes/s) @ 200ms
Your TCP Window limits you to: 8388 kbps (1049 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 51 hops
TTL value is ok.
Timestamps (RFC1323) = ON
Note: Timestamps add 12 bytes to the TCP header of each packet, reducing the space available for useful data.
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000 (0)
Sehe ich das richtig das die TCP Window Limits nicht so ganz dolle sind?