Wan keep alive ставьте Enable, MTU уменьшайте до 1300.

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Изменил MTU на 1272, включил WAN Keep-Alive.
Связь стала получше: аська стала реже отваливаться и почта теперь почти всегда доставляется без ошибок.

А влоге всеравно:

Mon Nov 15 13:05:19 2010 Disassociated: 192.168.0.12 query DNS for pop.mail.ru
Mon Nov 15 13:05:20 2010 Disassociated: 192.168.0.13 query DNS for pop.mail.ru
Mon Nov 15 13:05:22 2010 Disassociated: 192.168.0.10 query DNS for mc.yandex.ru
Mon Nov 15 13:05:22 2010 Disassociated: 192.168.0.10 query DNS for kiks.yandex.ru
Mon Nov 15 13:05:23 2010 Disassociated: 192.168.0.10 query DNS for suggest.yandex.ru
Mon Nov 15 13:05:45 2010 Disassociated: 192.168.0.7 query DNS for ch.rbc.ru
Mon Nov 15 13:05:45 2010 Disassociated: 192.168.0.7 query DNS for top.rbc.ru
Mon Nov 15 13:05:45 2010 Disassociated: 192.168.0.7 query DNS for amch.questionmarket.com
Mon Nov 15 13:05:46 2010 Disassociated: 192.168.0.7 query DNS for rbc.magna.ru
Mon Nov 15 13:05:46 2010 Disassociated: 192.168.0.7 query DNS for engine.video-link.ru
Mon Nov 15 13:05:46 2010 Disassociated: 192.168.0.7 query DNS for engine.medialand.ru
Mon Nov 15 13:05:53 2010 Disassociated: 192.168.0.6 query DNS for pop.mail.ru
Mon Nov 15 13:06:10 2010 Disassociated: 192.168.0.6 query DNS for www.mail.ru
Mon Nov 15 13:06:12 2010 Disassociated: 192.168.0.6 query DNS for mail.radar.imgsmail.ru
Mon Nov 15 13:06:12 2010 Disassociated: 192.168.0.6 query DNS for www.tns-counter.ru
Mon Nov 15 13:06:14 2010 Disassociated: 192.168.0.6 query DNS for avt.foto.mail.ru
Mon Nov 15 13:06:14 2010 Disassociated: 192.168.0.6 query DNS for r2.mail.ru
Mon Nov 15 13:06:15 2010 Disassociated: 192.168.0.6 query DNS for ad.adriver.ru
Mon Nov 15 13:06:16 2010 Disassociated: 192.168.0.6 query DNS for b.dclick.ru
Mon Nov 15 13:06:16 2010 Disassociated: 192.168.0.6 query DNS for i.dclick.ru
Mon Nov 15 13:06:18 2010 Disassociated: 192.168.0.6 query DNS for top5.mail.ru
Mon Nov 15 13:06:18 2010 Disassociated: 192.168.0.6 query DNS for counter.yadro.ru
Mon Nov 15 13:06:18 2010 Disassociated: 192.168.0.6 query DNS for counter.rambler.ru
Mon Nov 15 13:06:18 2010 Disassociated: 192.168.0.6 query DNS for rs.mail.ru
Mon Nov 15 13:06:19 2010 Disassociated: 192.168.0.6 query DNS for auth.mail.ru

По логам видно, что хосты не могут зарезолвить IP по доменному имени.
В после Secondary DNS Address пропишите публичный DNS, например 8.8.8.8.

_________________
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Показываю измененный скрин настройки WAN и лог после изменения.

http://zalil.ru/29977102

Скорее всего проблема с DNS провайдера, попробуйте адреса DNS поменять местами. Интернет при этом работает?

_________________
Форум не подразумевает под собой быстрый ответ, хотите быстрый и квалифицированный ответ - звоните в техподдержку компании D-Link 8-800-700-5465

Поменял местами.... Никак не повлияло. В логе ничего не изменилось, на связи никак не отобразилось.

Те же проблемы. Вот мой лог:
Thursday November 25, 2010 22:40:59 Disassociated: Blocked access attempt from 94.51.130.69:60734 to UDP port 49711
Thursday November 25, 2010 22:44:50 Disassociated: Blocked access attempt from 186.81.11.204:2424 to TCP port 5900
Thursday November 25, 2010 22:44:53 Disassociated: Blocked access attempt from 186.81.11.204:2424 to TCP port 5900
Thursday November 25, 2010 22:49:02 Disassociated: Blocked access attempt from 118.167.15.96:10840 to TCP port 25
Thursday November 25, 2010 22:52:06 Disassociated: Blocked access attempt from 124.237.78.9:6000 to TCP port 1080
Thursday November 25, 2010 23:09:18 Disassociated: Blocked access attempt from 222.186.24.97:6000 to TCP port 3306
Thursday November 25, 2010 23:10:25 Disassociated: Blocked access attempt from 95.26.198.88:32229 to UDP port 49711
Thursday November 25, 2010 23:14:50 Disassociated: Blocked access attempt from 61.147.99.95:6000 to TCP port 3306
Thursday November 25, 2010 23:25:50 Disassociated: Blocked access attempt from 184.154.110.242:12200 to TCP port 80
Thursday November 25, 2010 23:25:50 Disassociated: Blocked access attempt from 184.154.110.242:12200 to TCP port 9415
Thursday November 25, 2010 23:25:50 Disassociated: Blocked access attempt from 184.154.110.242:12200 to TCP port 8080
Thursday November 25, 2010 23:25:50 Disassociated: Blocked access attempt from 184.154.110.242:12200 to TCP port 9000
Thursday November 25, 2010 23:25:50 Disassociated: Blocked access attempt from 184.154.110.242:12200 to TCP port 8088
Thursday November 25, 2010 23:25:51 Disassociated: Blocked access attempt from 184.154.110.242:12200 to TCP port 808
Thursday November 25, 2010 23:25:51 Disassociated: Blocked access attempt from 184.154.110.242:12200 to TCP port 8090
Thursday November 25, 2010 23:25:51 Disassociated: Blocked access attempt from 184.154.110.242:12200 to TCP port 6588
Thursday November 25, 2010 23:25:51 Disassociated: Blocked access attempt from 184.154.110.242:12200 to TCP port 8000
Thursday November 25, 2010 23:25:51 Disassociated: Blocked access attempt from 184.154.110.242:12200 to TCP port 443
Thursday November 25, 2010 23:25:52 Disassociated: Blocked access attempt from 184.154.110.242:12200 to TCP port 81
Thursday November 25, 2010 23:25:52 Disassociated: Blocked access attempt from 184.154.110.242:12200 to TCP port 8085

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DSL-2500BRU, DIR-100, DIR-300, DI-808HV, DIR-628, DIR-620, DCS-2102, DCS-920, DVG-2101S, DVG-7111S

Проблема либо с ДНС провайдера, либо с маршрутами (ибо днс в другой подсети)
проверьте эти моменты