Q: AT&T MicroCell Rendered Inoperative after ISP Speed/Modem Upgrade.
I had the white AT&T MicroCell for several years: http://www.att.com/att/microcell/downloads/ATT3GMicroCell_UserManual_121610_FINA Lproof.pdf. It worked fine. The white MicroCell died about a year ago, and was replaced by a black version http://www.att.com/att/microcell/downloads/ATT_MicroCell_UserManual.pdf (which has only one ethernet port.). This black one worked ok as well. In both cases, the MicroCell was connected directly to my Time Capsule Router which is connected to the ISP modem in bridge mode (i.e. the TC is authenticating to the ISP):
CenturyLink DSL Line --> ISP Modem ===> Time Capsule ==> MicroCell (and rest of network)
Recently my ISP in Durango, CO (CenturyLink) upgraded my service from 1.5Mb/s to 12 Mb/s (hooray), replacing my old modem with a ZyXel C1000Z (for vDSL capability at the higher speeds). However, this upgrade rendered the MicroCell inoperative (boo). Everything else in the configuration stayed the same. After several weeks of troubleshooting with both AT&T and CenturyLink, the only setup that worked for the MicroCell is to take the C1000Z out of bridge mode and allow it to serve (DHCP) the MicroCell an IP. This configuration, however renders my network unavailable because I can't pass through the Ethernet connection to the TC (the black MicroCell does not have a second ethernet port to setup per http://www.macobserver.com/tmo/article/the_amazing_new_att_microcell_part_ii/ ). So I've left my network running, and left the poor MicroCell dangling on the LAN, blinking it's cell bars, indicating that it can't talk to the AT&T mother-ship.
CenturyLink hasn't been much help. AT&T was a bit more helpful, noting that they see port 4500 as not getting through. Why it was getting through before the upgrade, and not after is a bit of a mystery -- CenturyLink swears that they only filter Port 25.
Does anyone know of a way to rectify the issue? I've tried allocating port 4500 on the Time Capsule directly to the MAC / IP address of the MicroCell, but that a) renders iCloud in operative and b) doesn't work.
Any help would be appreciated.
Kirk
Time Capsule 802.11n (4th Gen)
Posted on Jun 24, 2015 6:20 AM
