Anyone with good VLAN knowledge on MT, please help.

So… I just hope that it is me just being stupid.
My ISP gave me /29 network with VLAN ID 3031
Just to test, I got realtek utility and set up VLAN ID on my laptop - the thing works…
Now - what could be easier - I added VLAN interface on top of ether1-gateway with 3031 ID, added ip address xxx.xxx.xxx.11/29 network xxx.xxx.xxx.8 gateway xxx.xxx.xxx.9 to vlan1 and tried to ping gateway - “no route to host”.
Is there any method of troubleshooting VLAN issues?
Tried on both routers I own - RB750 and RB230 with 1000base-t pci card.

Maybe to help you we should know:

/interface ethernet export
/interface vlan export
/ip address export
/ip route export

Sorry, for not posting that at first:

/interface ethernet
set 0 arp=enabled auto-negotiation=yes cable-settings=default
disable-running-check=yes disabled=no full-duplex=yes mac-address=
00:0C:42:03:35:6A mtu=1500 name=lan1010 speed=100Mbps
set 1 arp=enabled auto-negotiation=yes cable-settings=default
disable-running-check=yes disabled=no full-duplex=yes mac-address=
00:0C:42:03:35:6B mtu=1500 name=lan192 speed=100Mbps
set 2 arp=enabled auto-negotiation=yes cable-settings=default
disable-running-check=yes disabled=no full-duplex=yes l2mtu=16383
mac-address=54:E6:FC:80:C2:3E mtu=1500 name=wan speed=1Gbps

/interface vlan
add arp=enabled disabled=no interface=wan l2mtu=16379 mtu=1500 name=vlan1
use-service-tag=no vlan-id=3031
/ip address
add address=217.68.112.10/29 disabled=no interface=vlan1 network=217.68.112.8
add address=192.168.1.1/24 disabled=no interface=lan192 network=192.168.1.0
add address=10.10.10.1/24 disabled=no interface=lan1010 network=10.10.10.0


/ip route
add disabled=no distance=1 dst-address=0.0.0.0/0 gateway=217.69.112.9 scope=
30 target-scope=10

gateway=217.69.112.9
network=217.68.112.8


Do you notice the difference?

Well, sometimes, when you look with your own eyes, you don’t notice a mistake.
Thank you so much!

in conclusion, I made some very dumb mistakes:
RB750 did not connect directly to 1000base-t SFP converter, although the leds went on - will change it for rb750gl (because rb751 is no yet available, for some time now)
RB230… one number wrong…
Thank you, sup5, again!