(請網絡高手指教)轉用HKBN後vpn connection(晚上)變得很不穩定

我家是Home Office,以往一直用netvigator 6M上網。我在flashed了dd-wrt的router架設了vpn server (pptp) ,而唯一的vpn client(也是netvigator 6M用戶)每天都會用windows xp內置的vpn連線登入我的server,供我存取放在vpn client電腦裡的檔案。 File size大多不超過2MB。 雖然存取速度受ADSL限制而不高, 但連線什麼時候也很穩定。

現在轉用了bb100後(vpn client仍是用netvigator),日間vpn connection也很穩定,和以前用netvigator時差不多。 這是日間我ping vpn client 的 statistics:
9:53 AM
Ping statistics for 192.168.88.201:
    Packets: Sent = 50, Received = 50, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 20ms, Maximum = 29ms, Average = 21ms

但是每天由傍晚開始,vpn connection就變得不穩定:
6:15 PM
Ping statistics for 192.168.88.201:
    Packets: Sent = 50, Received = 45, Lost = 5 (10% loss),
Approximate round trip times in milli-seconds:
    Minimum = 22ms, Maximum = 138ms, Average = 25ms

由8:00pm開始vpn connection就更開始失控:
9:10 PM
Ping statistics for 192.168.88.201:
    Packets: Sent = 50, Received = 41, Lost = 9 (18% loss),
Approximate round trip times in milli-seconds:
    Minimum = 22ms, Maximum = 677ms, Average = 54ms

10:12 PM
Ping statistics for 192.168.88.201:
    Packets: Sent = 50, Received = 38, Lost = 12 (24% loss),
Approximate round trip times in milli-seconds:
    Minimum = 22ms, Maximum = 4065ms, Average = 141ms

由於packet loss的比例太高,所以根本就不能存取檔案,晚間工作就變得很不方便。  反觀以往用netvigator時就什麼鐘點也沒有分別,只是穩定地慢。  另外用hkbn晚間上網browsing和bt雖然是比日間慢了一點,但仍然可以接受(本地網站比netvigator快,外地網站就差不多)。

現在想請教,用bb100上網架設pptp server有沒有什麼秘技?  我想我的vpn setup應該沒有問題,否則也不會只是晚上不穩定。 如果我在vpn client的電腦上架設多一個router,做一個gateway to gateway connection,會不會有分別? (我估不會。)

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其實我仲可以保留netvigator行dual wan,請問:
1.) 用 dual wan router可以解決以上的問題嗎? 設定上會很複雜嗎?
2.)如果可指定某些connection行特定的wan,bt 下載時是否亦可指定connect tracker時用netvigator,而從peers下載時仍用HKBN,以解決HKBN封鎖tracker的問題?
3.)dual wan router有什麼介紹? 好似好多人用Linksys rv042,但已經是幾年前的model,現在買還可以嗎?

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