I have a ATT fiber line for a customer that has a 300/300 circuit, but its not a MIS they are telling me we cannot route a /26 (they have allocated) to my device behind it. 
Any options?
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Dennis Burgess
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call back, i dont think thatās accurate. What is the specific product?
Guess their broadband stuffā¹
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Dennis Burgess
Author of "Learn RouterOS- Second Editionā
Link Technologies, Inc ā Mikrotik & WISP Support Services
Office: 314-735-0270 Website: http://www.linktechs.net
Create Wireless Coverageās with www.towercoverage.com
Need MikroTik Cloud Management: https://cloud.linktechs.net
Yeah not going to happen on U-verse
Bonus points, the small business fiber has extremely limited NAT session limits (depends on hardware, but not greater than 16,000 sessions) and everything counts. Cold loading CNN.com (an AT&T company) in a default config without an adblocker will use close to 3000, which will saturate and cause errors on some of their gateway hardware (NVG595). If you want to use it for any serious purpose, stick a tunnel out to a real connection.
Ya not wishing to do NATā¦
Yep; but even IP Passthrough, routed subnet, etc. all count as NAT sessions against the internal NAT table.
BTW, thatās the feature youāre looking for - routed subnet. That will pass your /26 to another network device over an RFC1918 subnet. The steps depend on what particular gateway hardware they have, but a quick Google of the gateway model and ārouted subnetā should get you to the right spot. Assuming of course the other service limitations arenāt a dealbreaker.
Called Cascaded Router configuration on The POS router they gave ā¦ their support and their support āSupervisorā could not make it work. I just did ā¦ FUN.
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Dennis Burgess, Mikrotik Certified Trainer
MTCNA, MTCRE, MTCWE, MTCTCE, MTCINE, MTCSE, HE IPv6 Sage, Cambium ePMP Certified
Author of "Learn RouterOS- Second Editionā
Link Technologies, Inc ā Mikrotik & WISP Support Services
Office: 314-735-0270 Website: http://www.linktechs.net
Create Wireless Coverageās with www.towercoverage.com