ifconfig-push中的每一对IP地址表示虚拟客户端和服务器的IP端点。它们必须从连续的/30子网网段中获取(这里是/30表示xxx.xxx.xxx.xxx/30，即子网掩码位数为30)，以便于与Windows客户端和TAP-Windows驱动兼容。明确地说，每个端点的IP地址对的最后8位字节必须取自下面的集合：[ 1,2] [ 5,6] [ 9,10] [ 13,14] [ 17,18][ 21,22] [ 25,26] [ 29,30] [ 33,34] [ 37,38][ 41,42] [ 45,46] [ 49,50] [ 53,54] [ 57,58][ 61,62] [ 65,66] [ 69,70] [ 73,74] [ 77,78][ 81,82] [ 85,86] [ 89,90] [ 93,94] [ 97,98][101,102] [105,106] [109,110] [113,114] [117,118][121,122] [125,126] [129,130] [133,134] [137,138][141,142] [145,146] [149,150] [153,154] [157,158][161,162] [165,166] [169,170] [173,174] [177,178][181,182] [185,186] [189,190] [193,194] [197,198][201,202] [205,206] [209,210] [213,214] [217,218][221,222] [225,226] [229,230] [233,234] [237,238][241,242] [245,246] [249,250] [253,254]