Cisco SRP527W to MikroTik GRE Tunnel

I'm trying to set up a GRE Tunnel from a Cisco SRP527W Router to a Mikrotik RouterBoard.
The Cisco end is head office, whereas the Mikrotik is at a remote site.
The Mikrotik sits behind the ADSL router at the office with all ports for VPN forwarded to it.

As the Cisco SRP has no CLI it's harder to set up than traditional methods.

Tunnel No: 1
Checksum: none
Sequence: None
Key: None
Wan interface: ADSL
Destination I.P: Remote Site WAN
Remote IP Address/Sbunet Mask:

Local address:
Remote Address: Head Office WAN I.P

The Mikrotik has the I.P address also assigned in the I.P > Addresses list and is assigned to the GRE tunnel interface.
On the Mikrotik I have created a NAT Masquerade rule to point the Head Office Subnet.

From the Mikrotik, pinging the only shows a timeout...

Any ideas where I may have missed something???
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kiwistagConnect With a Mentor Author Commented:
After contacting Netcomm they suggested just switching the Router to Bridge Mode. Am yet to try but it seems like the only option.
Is it still actual?
kiwistagAuthor Commented:
No luck as of yet...
kiwistagAuthor Commented:
The issue between sites is at one end the Netcomm NBPlus6Wn ADSL router is somehow blocking/interfering with the GRE tunnel. I am looking into why this may be as all NAT rules are in that should be..
kiwistagAuthor Commented:
An option to resolve was offered by one of the routers manufacturers after they checked it with their engineers.
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