AT&T MX67 in Passthrough to SonicWall

[hoss82]

I have a client that decided to switch ISPs on their own. AT&T installed an MX67. They gave the customer a /29 block. They configured the MX67 in passthrough. The Meraki WAN is configured with .122 in the block and it's default gateway is set to .121. The ISP told us we could just plug the SonicWall into one of the open LAN ports  on the Meraki and we could use the next IP in the block .123. We have been unable to get this to work. We even tried configuring a laptop in the static block and it's not working either. Am I missing something to make this work? I am unable to ping .121 and .122 from the SonicWall as well.

[Mloraditch]

This can work if you have a routed block from the ISP, however that doesn't appear to be the case. If you are not meraki users I would just remove the meraki and connect your sonicwall directly. Probably will have to put it somewhere secure so you can return once you the contract is up and you are able to renegotiate to DIA only. 

There may be other solutions but I would operate on this like when FiOs almost always ships a router that is unnecessary, remove it and do your thing the way you want. Might have to turn off some alert emails but I wouldn't think att will care.