The go ethereum geth cannot directly and quickly sync up blocks between peers in local network, why? I have two peers in local network, through NAT to Internet, the first peer eth.blockNumber is 5667928, the second peer eth.blockNumber is 5625612. I have use admin.addPeer each other. And admins.peers can list another peer. I consider that the second peer should be quick sync up to the first peer, but about 10 hours later, The difference between the two peers is still very large (>40000). What is wrong with my operation? is there something I missed. What can I do to speed up the second peer sync up processing. Any help would be greatly appreciated.