We have a network 20.x.x.x with 200 sites running EIGRP on cisco routers. A non cisco router wants to connect to us via a T1 interface. We can ping their Serial (188.8.131.52) interface and so can they (184.108.40.206). Non cisco rtr is assigned an address of 20.1.220.x. From their network, they can ping us, but we can't. What conf changes need to be made at our end (or theirs) so that we can ping the 20.1.220.x
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