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| In this paper, at first, we analyze the necessity of NAT and firewall. Meanwhile we should notice that NAT and firewall are some impeditive to an end-to-end session, in other words, we need to traverse them under some circumstances. In the following sections, we enumerate several kinds of solutions for NAT and firewall traversal. Unfortunately, all of current solutions have respective defects, so that we could not traverse NAT and firewall thoroughly. To resolve these problems, we introduce Next Steps in Signaling (NSIS) in this paper. NSIS can not be only applied in traditional network, but also can be used for mobile scenarios. It can deal with problems caused by the mobility. |
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| Keywords:NSIS，NAT，Firewall，Mobile IPv6，Traversal |
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