RV042G and SG200-18 Failed to work

1) SG200-18 configuration
- VLAN 10 and 20
- VLAN 10: Port 1 tagged, Port 14 untagged
- VLAN 20: Port 1 tagged, Port 13 untagged
- Port 1: 1UP, 10T, 20T Admit tagged PVID 1
- Port 14: 10UP Admit untagged PVID 10
- Port 13: 20UP Admit untagged PVID 20
Port 1 connected to Fiber ONT (On VLAN 10), Port 14 connected to RV042G WAN.
Once RV042G LAN connects to SG200-18 (VLAN 1) port, RV042G WAN unable to get public IP and internet connection gone, port 14 showing "Discarding" under "Spanning Tree"
Can anyone help?

Thanks Dave for long long explanations!!!
Here's my answer in RED:
Hi Lian,
You said the SG200 is a layer 2 router, it's a layer two switch. But this brings up a point which is, Tom anf myself may be slightly misinterpreting your post.
So I am going to ask a couple of questions to better understand the setup.
Does the ONT really transmit out TAGGED VLAN frames to my switch or does it only transmit to my switch untagged Ethernet frames.
1.    A way to test this , is can your PC plug into the ONT and get internet connectivity ?
[lwloo]Yes, it transmit TAGGED VLAN, 10 for internet, 20 for TV, 30 for Phone. By connecting laptop without setting NIC virtual interface you will not get the internet ip address.
2.    I'm guessing the ONT is just a Internet connection from SINGTEL for Internet connectivity, am I correct ?
[lwloo]Yes, ONT is the Optical network terminal for Singtel Fiber internet connection.
You show in your orginal post the following vlan configuration ;
1) SG200-18 configuration
- VLAN 10 and 20
- VLAN 10: Port 1 tagged, Port 14 untagged
- VLAN 20: Port 1 tagged, Port 13 untagged
- Port 1: 1UP, 10T, 20T Admit tagged PVID 1
3.    Is the diagram further up this post correct or should VLAN1 be really VLAN10 ?
[lwloo]Sorry, my mistake on that diagram. LAN1 refer to port 1. The actual diagram:
If the ONT presents you with just a copper ethernet connection of untagged frames, i think the configuration of GE1 on the switch is wildly incorrect.
4.    Why do you have unagged vlan 1 on port GE1 ?
[lwloo]If I remove vlan 1 from GE1, it be become internal vlan with 4095P added automatically.
   5    Why do you have tagged VLAN 20 on the GE1 (connection to ONT) What is the purpose of VLAN20 ?
[lwloo]VLAN 10 for internet, VLAN 20 for TV, VLAN 30 for Phone, VLAN 40 for Management.
VLAN mode on GE1 is real suspect, in fact I cannot understand why you are using general mode on your switch ports. .
[lwloo]Without choosing general I will not be able to choose “Admit Tagged Frame”; if I choose trunk, all option will be grayed out.
VLAN interface General mode can be disruptive, as you have seen from your results, have a look at the description from the built in admin guide by pressing the help icon in the top right hand corner of your screen.
here is a acopy of the help text from my SG300 series switch.
Interface VLAN Mode—Select the interface mode for the VLAN. The options are:
•    General—The interface can support all functions as defined in the IEEE 802.1q specification. The interface can be a tagged or untagged member of one or more VLANs.
•    Access—The interface is an untagged member of a single VLAN. A port configured in this mode is known as an access port.
•    Trunk—The interface is an untagged member of one VLAN at most, and is a tagged member of zero or more VLANs. A port configured in this mode is known as a trunk port.
Arghhh that always raises a warning sign. General mode allows a untagged switch port to be members of many VLANs..wow... useful if you are using radius to allocate a VLAN to a 802.1x PC client, but it seems dangerous in your application.
Why is GE1 of the switch in General mode, why not leave all ports in the default trunk mode    it's safer
[lwloo]I will try later.
(note: trunk mode allows for one untagged VLAN by many tagged VLANs )
If the ONT transits untagged frames to the switch and is just a Internet connection.the try the following steps to get the Internet to the wan port of the RV042G.
[lwloo]No, if ONT transits untagged frames then life will be much more easier. 
step 1. OK leave the ingress port GE1 in trunk mode, in fact all ports to trunk mode.
step 2. Add vlan10 as untagged member of GE1. (you may have to exclude VLAN1)
Step 3. Make switch port GE14 a untagged member of VLAN10 ( you may have to exclude VLAN1 from GE14.)
If the ONT is transmitting multiple tagged VLANS into your network the above three steps wont work.
So lets see some answers to my questions above, as i think i can spot a configuration issue if my assumptions are correct.
Regards Dave

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rv042 wan1 -------------- sg200 port 1
rv042 wan2 -------------- sg200 port 5
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