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I am looking for a âCisco IOS 12.4 with supported Mobile Wireless - GGSN for 28xx routerâ.
I am going to send you a diagram which might be helpful to understand what am I looking for.
not my core expertise here but it looks like GGSN support is only in the 7200 and 7600/6500 MWAN.
Here is one link that might help:
For questions about what IOS version supports a specific feature you can always try Feature Navigator (www.cisco.com/go/fn).