martin_liang的专栏

转自出处SIP can be run, for example, over UDP, TCP or TCP with TLS (SSL) encryption however standard "A" DNS record lookups won't tell you anything about which of these protocols to use. NAPTR rec

转自出处：All types of NAT fall into two categories; Static NAT and Dynamic NAT. Static NAT is where administrators manually create and maintain the NAT mappings and is usually associated

转自出处：http://think-like-a-computer.com/2011/09/19/symmetric-nat/

http://www.blogjava.net/amigoxie/archive/2010/05/28/322182.html1.    介绍RFC3581的下载地址：http://www.ietf.org/rfc/rfc3581.txt该协议比较简短，主要用于描述rport（response-port）机制。1.1 NAT分类NAT：网络地址转换(NAT,Ne