Hi all,
At last problem is solved, it is MTU size issue as RON, RBEVAART, WIMCLEND identified.
By the way, just thing that make me confused.
- On my draytek router (default MTU: 1438), and this router is configured to be PPPOE client -> every one behind this runs OK
- But when I configured my SRX 240 to be PPPOE client with MTU: 1438 -> MTU issue happened ... :-(. I used ping to identify the optimal setting for MTU size -> it is 1272. Things work perfect.
Any explanation for this
Anyway, thank you all for helping to resolve my MTU issue.