I bought Mikrotik RB2011UiAs-2Hnd-IN today, i use quick set, home AP mode and PPPoE status is connected, I can open google, gmail, facebook websites, but I can't open most of other websites such as Wikipedia, www.sina.com.cn, www.creaders.net, etc., even I can ping these website, but can' t open, what's wrong with this router?

I would have to look at your config, but the problem may not be the router. Some malware can cause problems like that.

I bought Mikrotik RB2011UiAs-2Hnd-IN today, i use quick set, home AP mode and PPPoE status is connected, I can open google, gmail, facebook websites, but I can't open most of other websites such as Wikipedia, http://www.sina.com.cn, http://www.creaders.net, etc., even I can ping these website, but can' t open, what's wrong with this router?

Try setting the MAX MTU and MAX MRU on your PPPoE interface to 1492 instead of 1500.

Sounds similar to problem I have.

Try setting a manual DNS server (8.8.8.8, 8.8.4.4) in the PC.

If that works try setting external DNS server in /ip dhcp-server network

Rick

even I can ping these website, but can' t open, what's wrong with this router?

Try setting the MAX MTU and MAX MRU on your PPPoE interface to 1492 instead of 1500.

I think this is the most likely fix.

We had a similar issue with pppoe customers being uable to use certain sites, but everything else seemed to work flawlessly. The sites they complained about seemed to mostly be hosted on Akamai. We added the clamp-mss setting to our routers (cisco calls it adjust-mss) and then they were able to reach all websites.

So I am not using PPPOE.

I should set this on the Gateway router?  The client is a 3rd party router. (netgear, dlink, ) Set the MAX MTU/MRU to 1492 on the third party or on my central distribution router?

Rick