【問題】請教 FTTP 10M/2M跟 IP分享器的連線速度問題？

**Briian** · 2007-12-06, 09:48 PM

FTTP 10M/2M跟 IP分享器的連線速度問題？

最近剛接好中華電信的FTTB光纖網路（10M/2M），是透過VDSL從巷口電信箱連進來的，應該是沒超過800M吧，我猜。

光纖剛裝好時，直接用電腦連線速度都正常，可是一通過IP分享器，就開始龜速了，可是卻是龜速的方式卻很怪。連台灣的網站都正常，HINET抓100M檔案都可以到1.2M的速度，可是要抓國外網站的檔案，速度都在10K以下（只有抓國外檔案才這樣，抓台灣的檔案都正常）。

同樣的環境，換成直接接電腦用PPPOE上網就正常（100K以上），一接上IP分享器就10K以下。

真是奇怪說，不知道是否有什麼可以調整的地方？ MTU什麼的，那些有效嗎？我的IP分享器是Zywall 2+，請幫忙提供點意見... 感謝...

我用XP直接PPPOE上網是：

語法:

TCP options string = 020405a001010402
MTU = 1480
MTU is optimized for Windows XP PPoE DSL broadband. If not, consider raising MTU to 1500 for optimal throughput.
MSS = 1440
MSS is optimized for Windows XP PPPoE DSL broadband. If not, consider raising your MTU value.
Default TCP Receive Window (RWIN) = 17280
RWIN Scaling (RFC1323) = 0 bits
Unscaled TCP Receive Window = 17280

RWIN is a multiple of MSS
Other RWIN values that might work well with your current MTU/MSS:
506880 (MSS x 44 * scale factor of 8)
253440 (MSS x 44 * scale factor of 4)
126720 (MSS x 44 * scale factor of 2)
 63360 (MSS x 44)
bandwidth * delay product (Note this is not a speed test):

Your TCP Window limits you to: 691 kbps (86 KBytes/s) @ 200ms
Your TCP Window limits you to: 276 kbps (35 KBytes/s) @ 500ms
Consider increasing your RWIN value to optimize TCP/IP for broadband.

用IP分享器上網是：

語法:

TCP options string = 020405ac01010402
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) = 65535
RWIN Scaling (RFC1323) = 0 bits
Unscaled TCP Receive Window = 65535

Note: TCP 1323 Options need to be enabled for RWIN over 2^16 (65535). Windows 9x might also need the MS Vtcp386 fix.
For optimum performance, consider changing RWIN to a multiple of MSS.
Other RWIN values that might work well with your current MTU/MSS:
511104 (MSS x 44 * scale factor of 8)
255552 (MSS x 44 * scale factor of 4)
127776 (MSS x 44 * scale factor of 2)
 63888 (MSS x 44)
bandwidth * delay product (Note this is not a speed test):

Your TCP Window limits you to: 2621 kbps (328 KBytes/s) @ 200ms
Your TCP Window limits you to: 1049 kbps (131 KBytes/s) @ 500ms

不知道跟些數據是否有關系？該調怎樣才OK？

我抓的檔案是：
ftp://dnl-us4.kaspersky-labs.com/tri....0.0.125en.exe

用IP分享器跑5.8K....

**billhi** · 2007-12-06, 09:59 PM

我是直接連沒用IP分享器，下載您提共的檔案速度約4.8KB/S
所以您要不要再檢查看看直接連的速度，應該跟IP分享器無關吧！

**Briian** · 2007-12-06, 11:39 PM

我原本也以為跟IP分享器無關，可是真的速度有差說，可能舉的例子不好，很奇怪的是，原本用 4M/1M的時候，下載過的檔案速度起來都200K以上，一樣的檔案換用FTTB來下載，反而速度慢到爆.....

**fusopada** · 2007-12-10, 05:11 PM

IP分享器韌體寫的好壞，確實會影響到上下傳之速度
個人使用中8M/640K ADSL 透過IP分享器下載速度200KB/SEC到頂
移除IP分享器後下載曾飆到4-500KB/SEC左右

**ryusian** · 2007-12-10, 10:00 PM

我是用hinet 10m/2m,但用早期的SAR6104 IP分享器好像只能跑到200K,直接接PC跑可以跑到1000K,是IP分享器沒辦法跑到那麼快嗎?

**waiwai** · 2007-12-10, 10:33 PM

MSS 是 Maximum Segment Size ( header packet not included )

我用 v2104 , ping -f -l 1414 192.168.1.1 時才 Ping 到 reply time.

所以設定在 V2104 的 ppp_mss= 1442 ( 1414 + 28 )

Zywall 2+ 的 IP Share 沒用過, 不予置評