Zyxel OMNI ADSL LAN H [134/533] Tcp maximum incomplete blocking time

Ɋɭɤɨɜɨɞɫɬɜɨ ɩɨɥɶɡɨɜɚɬɟɥɹ ɞɥɹ ɦɚɪɲɪɭɬɢɡɚɬɨɪɨɜ ɫɟɪɢɢ OMNI ADSL LAN

ɇɚɫɬɪɨɣɤɚ ɦɟɠɫɟɬɟɜɨɝɨ ɷɤɪɚɧɚ 11-5

4. ɉɪɨɩɭɫɤɧɚɹ ɫɩɨɫɨɛɧɨɫɬɶ ɫɟɬɢ.

5. Ɍɢɩ ɬɪɚɮɢɤɚ ɞɥɹ ɨɬɞɟɥɶɧɵɯ ɫɟɪɜɟɪɨɜ.

ȿɫɥɢ ɩɨ ɩɪɢɱɢɧɚɦ, ɡɚɜɢɫɹɳɢɦ ɨɬ ɤɚɤɢɯ-ɬɨ ɢɡ ɜɵɲɟɩɟɪɟɱɢɫɥɟɧɧɵɯ ɮɚɤɬɨɪɨɜ, ɫɟɬɶ ɪɚɛɨɬɚɟɬ

ɦɟɞɥɟɧɧɟɟ, ɱɟɦ ɨɛɵɱɧɨ (ɨɫɨɛɟɧɧɨ ɟɫɥɢ ɢɦɟɸɬɫɹ ɦɟɞɥɟɧɧɵɟ ɫɟɪɜɟɪɵ ɢɥɢ ɫɟɪɜɟɪɵ, ɨɛɪɚɛɚɬɵɜɚɸɳɢɟ

ɛɨɥɶɲɨɟ ɱɢɫɥɨ ɡɚɞɚɱ ɢ ɩɨɷɬɨɦɭ ɱɚɫɬɨ ɡɚɧɹɬɵɟ), ɡɧɚɱɟɧɢɹ ɩɨ ɭɦɨɥɱɚɧɢɸ ɧɟɨɛɯɨɞɢɦɨ ɭɦɟɧɶɲɢɬɶ.

ɂɡɦɟɧɟɧɢɹ ɡɧɚɱɟɧɢɣ ɞɨɩɭɫɬɢɦɵɯ ɩɪɟɞɟɥɨɜ ɞɨɥɠɧɵ ɜɵɩɨɥɧɹɬɶɫɹ ɞɨ ɩɪɨɞɨɥɠɟɧɢɹ ɪɚɛɨɬɵ ɩɨ

ɧɚɫɬɪɨɣɤɟ ɩɚɪɚɦɟɬɪɨɜ ɦɟɠɫɟɬɟɜɨɝɨ ɷɤɪɚɧɚ.

11.4.3 ɉɨɥɭɨɬɤɪɵɬɵɟ ɫɨɟɞɢɧɟɧɢɹ

ɋɥɢɲɤɨɦ ɛɨɥɶɲɨɟ ɱɢɫɥɨ ɩɨɥɭɨɬɤɪɵɬɵɯ ɫɨɟɞɢɧɟɧɢɣ (ɜɵɪɚɠɟɧɧɨɟ ɤɨɧɤɪɟɬɧɵɦ ɱɢɫɥɨɦ ɢɥɢ ɜ ɜɢɞɟ

ɱɚɫɬɨɬɵ ɩɨɫɬɭɩɥɟɧɢɣ) ɦɨɠɟɬ ɨɡɧɚɱɚɬɶ ɧɚɥɢɱɢɟ ɚɬɚɤɢ Denial of Service. Ⱦɥɹ TCP "ɩɨɥɭɨɬɤɪɵɬɨɟ"

ɫɨɟɞɢɧɟɧɢɟ ɨɡɧɚɱɚɟɬ, ɱɬɨ ɨɧɨ ɧɟ ɭɫɬɚɧɨɜɥɟɧɨ ɩɨɥɧɨɫɬɶɸ, ɬ.ɟ. ɧɟ ɜɵɩɨɥɧɟɧ ɬɪɟɯɫɬɨɪɨɧɧɢɣ TCP-ɨɛɦɟɧ

ɡɚɩɪɨɫɚɦɢ (ɫɦ. Ɋɢɫ. 10-2). Ⱦɥɹ UDP, "ɩɨɥɭɨɬɤɪɵɬɨɟ" ɫɨɟɞɢɧɟɧɢɟ ɨɡɧɚɱɚɟɬ, ɱɬɨ ɦɟɠɫɟɬɟɜɵɦ ɷɤɪɚɧɨɦ

ɧɟ ɨɛɧɚɪɭɠɟɧ ɨɬɜɟɬɧɵɣ ɬɪɚɮɢɤ.

OMNI ADSL ɨɩɪɟɞɟɥɹɟɬ ɤɚɤ ɨɛɳɟɟ ɱɢɫɥɨ ɢɦɟɸɳɢɯɫɹ ɜ ɞɚɧɧɵɣ ɦɨɦɟɧɬ ɩɨɥɭɨɬɤɪɵɬɵɯ ɫɨɟɞɢɧɟɧɢɣ,

ɬɚɤ ɢ ɱɚɫɬɨɬɭ

ɩɨɩɵɬɨɤ ɭɫɬɚɧɨɜɢɬɶ ɫɨɟɞɢɧɟɧɢɟ. Ⱦɥɹ ɨɛɨɢɯ ɬɢɩɨɜ ɫɨɟɞɢɧɟɧɢɣ, TCP ɢ UDP, ɫɱɢɬɚɟɬɫɹ

ɱɢɫɥɨ ɩɨɥɭɨɬɤɪɵɬɵɯ ɫɨɟɞɢɧɟɧɢɣ ɢ ɢɧɬɟɧɫɢɜɧɨɫɬɶ ɩɨɫɬɭɩɥɟɧɢɣ ɡɚɩɪɨɫɨɜ. ɉɨɞɫɱɟɬɵ ɩɪɨɢɡɜɨɞɹɬɫɹ

ɩɨɦɢɧɭɬɧɨ.

Ʉɨɝɞɚ ɱɢɫɥɨ ɫɭɳɟɫɬɜɭɸɳɢɯ ɩɨɥɭɨɬɤɪɵɬɵɯ ɫɨɟɞɢɧɟɧɢɣ ɩɪɟɜɵɲɚɟɬ ɦɚɤɫɢɦɚɥɶɧɨ ɞɨɩɭɫɬɢɦɵɣ ɩɪɟɞɟɥ

(max-incomplete high), OMNI ADSL ɧɚɱɢɧɚɟɬ ɭɞɚɥɹɬɶ ɩɨɥɭɨɬɤɪɵɬɵɟ ɫɨɟɞɢɧɟɧɢɹ ɞɥɹ ɪɚɡɦɟɳɟɧɢɹ

ɧɨɜɵɯ ɡɚɩɪɨɫɨɜ. ɉɨɥɭɨɬɤɪɵɬɵɟ ɫɨɟɞɢɧɟɧɢɹ ɛɭɞɭɬ ɭɞɚɥɹɬɶɫɹ ɞɨ ɬɟɯ ɩɨɪ, ɩɨɤɚ ɢɯ ɱɢɫɥɨ ɧɟ ɭɦɟɧɶɲɢɬɫɹ

ɞɨ ɡɧɚɱɟɧɢɹ, ɧɟ ɩɪɟɜɵɲɚɸɳɟɝɨ ɞɪɭɝɨɝɨ (ɦɢɧɢɦɚɥɶɧɨɝɨ) ɞɨɩɭɫɬɢɦɨɝɨ ɩɪɟɞɟɥɚ (max-incomplete low).

ȿɫɥɢ ɱɚɫɬɨɬɚ ɧɨɜɵɯ ɩɨɩɵɬɨɤ ɫɨɟɞɢɧɟɧɢɣ ɩɪɟɜɵɫɢɬ ɦɚɤɫɢɦɚɥɶɧɨ ɞɨɩɭɫɬɢɦɵɣ ɭɪɨɜɟɧɶ ɜ ɦɢɧɭɬɭ (one-

minute high), OMNI ADSL ɧɚɱɧɟɬ ɭɞɚɥɹɬɶ ɩɨɥɭɨɬɤɪɵɬɵɟ ɫɨɟɞɢɧɟɧɢɹ ɞɥɹ ɪɚɡɦɟɳɟɧɢɹ ɧɨɜɵɯ

ɡɚɩɪɨɫɨɜ. ɉɨɥɭɨɬɤɪɵɬɵɟ ɫɨɟɞɢɧɟɧɢɹ ɛɭɞɭɬ ɭɞɚɥɹɬɶɫɹ ɞɨ ɬɟɯ ɩɨɪ, ɩɨɤɚ ɱɚɫɬɨɬɚ ɧɨɜɵɯ ɩɨɩɵɬɨɤ

ɫɨɟɞɢɧɟɧɢɣ ɧɟ ɫɧɢɡɢɬɫɹ ɞɨ ɡɧɚɱɟɧɢɹ, ɧɟ ɩɪɟɜɵɲɚɸɳɟɝɨ ɞɪɭɝɨɝɨ (ɦɢɧɢɦɚɥɶɧɨɝɨ) ɞɨɩɭɫɬɢɦɨɝɨ

ɩɪɟɞɟɥɚ ɜ ɦɢɧɭɬɭ (one-minute low). ɑɚɫɬɨɬɚ ɫɨɟɞɢɧɟɧɢɣ - ɷɬɨ ɱɢɫɥɨ ɧɨɜɵɯ ɩɨɩɵɬɨɤ, ɨɛɧɚɪɭɠɟɧɧɨɟ ɡɚ

ɩɨɫɥɟɞɧɢɣ ɭɫɬɚɧɨɜɥɟɧɧɵɣ ɩɟɪɢɨɞ ɜɵɛɨɪɤɢ ɞɥɢɬɟɥɶɧɨɫɬɶɸ ɜ ɨɞɧɭ ɦɢɧɭɬɭ.

Ɂɧɚɱɟɧɢɹ TCP Maximum Incomplete ɢ Blocking Time

ɋɥɢɲɤɨɦ ɛɨɥɶɲɨɟ ɱɢɫɥɨ ɩɨɥɭɨɬɤɪɵɬɵɯ ɫɨɟɞɢɧɟɧɢɣ ɫ ɨɞɧɢɦ ɢ ɬɟɦ ɠɟ ɚɞɪɟɫɨɦ ɯɨɫɬɚ ɧɚɡɧɚɱɟɧɢɹ

ɦɨɠɟɬ ɨɡɧɚɱɚɬɶ ɚɬɚɤɭ Denial of Service , ɧɚɩɪɚɜɥɟɧɧɭɸ ɧɚ ɞɚɧɧɵɣ ɯɨɫɬ-ɤɨɦɩɶɸɬɟɪ.

ȿɫɥɢ ɱɢɫɥɨ ɩɨɥɭɨɬɤɪɵɬɵɯ ɫɨɟɞɢɧɟɧɢɣ ɫ ɨɞɧɢɦ ɢ ɬɟɦ ɠɟ ɚɞɪɟɫɨɦ ɧɚɡɧɚɱɟɧɢɹ ɩɪɟɜɵɲɚɟɬ ɞɨɩɭɫɬɢɦɵɣ

ɩɪɟɞɟɥ (TCP Maximum Incomplete), Pestige ɧɚɱɢɧɚɟɬ ɭɞɚɥɹɬɶ ɩɨɥɭɨɬɤɪɵɬɵɟ ɫɨɟɞɢɧɟɧɢɹ ɨɞɧɢɦ ɢɡ

ɫɥɟɞɭɸɳɢɯ ɫɩɨɫɨɛɨɜ: