is trange then when i download from the same site before and the problem excist in firmware 1.32 and not below.
It's your assumtion, since there's no way to check if it happens now with 1.2x firmware...
The reason why it is not DIR related is that your 655 connects to your internet modem, and the internet modem connects to the download site. And the modem usually has it's own settings so there is no 1-on-1 connection between the download site and your router, there's a modem in between. So trust me when I say that it is not a router issue.
You can ask your ISP what their MTU setting is with your subscription. For AOL DSL 1400 is the max MTU to use.
The most commonly used values:
* 1500. The largest Ethernet packet size; it is also the default value. This is the typical setting for non-PPPoE, non-VPN connections. The default value for routers, adapters and switches.
* 1492. The size PPPoE prefers.
* 1472. Maximum size to use for pinging. (Bigger packets are fragmented.)
* 1468. The size DHCP prefers.
* 1460. Usable by AOL if you don't have large email attachments, etc.
* 1430. The size VPN and PPTP prefer.
* 1400. Maximum size for AOL DSL.
* 576. Typical value to connect to dial-up ISPs.