My understanding is that AT&T uses an MPLS/VRF CE router facing the user such that the resulting network connectivity is a private MPLS VPN. VZW apparently requires the user to implement a GRE/IPSec configuration just to reach their MPLS/VRF layer. The resulting user router config is thus much simpler with AT&T. Haven't heard about Sprint though. -----Original Message----- From: Crooks, Sam [mailto:Sam.Crooks@experian.com] Sent: Tuesday, April 14, 2009 9:26 PM To: nanog@nanog.org Subject: Looking for AT&T / Verizon / Sprint WWAN service impressions - on oroff-list replies welcome I'm considering use of AT&T / Verizon / Sprint WWAN services and the Cisco 3G router interface cards/integrated module in C880 routers for primary or backup WAN network connectivity for routers. I'm looking for information from users of these services on the following: - addressing - Do these WWAN services use dynamic, PPPoE or static IP assignment typically? Any of the 3? All? - is static IP assignment available? - do these service providers use NAT within their network? - How is the service reliability? In most cases, is the service available for use when you need to use it? - How is the service coverage area? Do you have problems getting sufficient coverage in the deplouyment location to support desired speeds (say 512kbps up/down as a minimum)? - is ESP / IKE / IPsec permitted through un-rate-limited and un-molested by the providers? - If you build a IPsec/GRE tunnel over these services, do you have frequent issues with the tunnel dropping, or a dynamic routing protocol running through the tunnel going down frequently? Also interested in similar information on impressions of similar EMEA WWAN service providers, particularly Vodaphone and T-Mobile, if anyone has experiences with these. Replies on-list or off-list are welcome.... Your choice. Cisco 3G interface and provider information: http://www.cisco.com/en/US/products/ps7272/index.html http://www.cisco.com/en/US/prod/routers/networking_solutions_products_ge nericcontent0900aecd80601f7e.html#~north-america Regards, Sam Crooks