哪位能说说ip route 0.0.0.0 0.0.0.0和ip default-network命令区别吗？
　　我所知道ip route 命令会向表里加条静态ip default-network命令不会
　　ip route 命令按接口和地址指定缺省路由ip default-network命令按网络指定
　　谁能说说还有什么区别？以及在什么情况下使用哪条吗？还有他们在再发布时区别！
　　FW:发信人: canway
　　整理人: sanjose(2000-09-26 10:54:44), 站内信件
　　Q:
　　听了各位解释有些明白可是路由器没有路由还叫路由器吗那样两个命令
　　
　　功能似乎是样都是把不知道到包发给下个站点可是我在做个项目
　　时
　　设置ip default-gateway就不行用ip route 0.0.0.0 0.0.0.0 xxxxxxxx
　　就通了 是不是这样对于ip default-gateway来说只有对这个网段才有效
　　而从其他
　　网段路由过来其他网段信息到了用ip default-gateway网段就不能利用这
　　
　　个 命令传送而是要用ip route 0.0.0.0 0.0.0.0.了也就是ip route 0.0.0
　　.0
　　0.0.0.0才能完成路由功能不知道理解对吗
　　
　　Answer:
　　1 ip default-gateway用和路由器不作路由时使用这时路由器就只是台主
　　机好象Win95PC样需要配个网关才能和外界通信
　　如果 “no ip routing"则路由器就不作路由这时你可以配bridge-group把路
　　由表及里器当switch使
　　
　　2 ip route 0.0.0.0 0.0.0.0 用于履行路由功能如果ip routin
　　g是enable则ip default-gateway不起作用.
　　
　　FW:区别在于ip route本机生效ip default-network可以影响整个路由域
　　http://www.cisco.com/en/US/customer...shtml#ipnetwork
　　FW:Introduction
　　This Tech Note explains how to configure a default route, or gateway of last resort, using the following IP commands: ip default-gateway, ip default-network, and ip route 0.0.0.0 0.0.0.0. Let's look at each of these commands in more detail.
　　Before You Begin
　　Conventions
　　For more information on document conventions, see the Technical Tips Conventions.
　　
　　Prerequisites
　　There are no specic prerequisites for this document.
　　
　　Components Used
　　This document is not restricted to specic software and hardware versions.
　　
　　The information presented in this document was created from devices in a specic lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it.
　　
　　ip default-gateway
　　The ip default-gateway command dfers from the other two commands in that it should only be used when ip routing is disabled on the router.
　　
　　For instance, the router is a host in the IP world, you can use this command to a default gateway for it. You might also use this command when your low end Cisco router is in boot mode in order to TFTP a Cisco IOS® Software image to the router. In boot mode, the router doesn't have ip routing enabled.
　　
　　ip default-network
　　Unlike the ip default-gateway command, you can use ip default-network when ip routing is enabled on the Cisco router. When you configure ip default-network the router considers routes to that network for ation as the gateway of last resort on the router.
　　
　　For every network configured with ip default-network, a router has a route to that network, that route is flagged as a candidate default route. Let's look at the following routing table taken from a Cisco router:
　　
　　2513#show ip route
　　Codes: C - connected, S - , I - IGRP, R - RIP, M - mobile, B - BGP
　　D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF er area
　　E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
　　i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
　　Gateway of last resort is not
　　161.44.0.0 255.255.255.0 is subnetted, 1 subnets
　　C 161.44.192.0 is directly connected, Ethernet0
　　S 198.10.1.0 [1/0] via 161.44.192.2
　　131.108.0.0 255.255.255.0 is subnetted, 1 subnets
　　C 131.108.99.0 is directly connected, TokenRing0
　　
　　
　　Note the route to 198.10.1.0 via 161.44.192.2 and that the gateway of last resort isn't . If we configure ip default-network 198.10.1.0, the routing table changes to the following:
　　
　　2513#show ip route
　　Codes: C - connected, S - , I - IGRP, R - RIP, M - mobile, B - BGP
　　D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF er area
　　E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
　　i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
　　
　　Gateway of last resort is 161.44.192.2 to network 198.10.1.0
　　
　　161.44.0.0 255.255.255.0 is subnetted, 1 subnets
　　C 161.44.192.0 is directly connected, Ethernet0
　　S 161.44.0.0 255.255.0.0 [1/0] via 161.44.192.0
　　S* 198.10.1.0 [1/0] via 161.44.192.2
　　131.108.0.0 255.255.255.0 is subnetted, 1 subnets
　　C 131.108.99.0 is directly connected, TokenRing0
　　2513#show ip protocols
　　2513#
　　
　　
　　We can see the gateway of last resort has now been as 161.44.192.2. This result is independent of any routing protocol, as shown by the show ip protocols command at the bottom of the output.
　　
　　We can add another candidate default route simply by configuring another instance of ip default-network:
　　
　　2513#config terminal
　　Enter configuration commands, one per line. End with CNTL/Z.
　　2513(config)#ip route 171.70.24.0 255.255.255.0 131.108.99.2
　　2513(config)#ip default-network 171.70.24.0
　　2513(config)#^Z
　　
　　2513#show ip route
　　Codes: C - connected, S - , I - IGRP, R - RIP, M - mobile, B - BGP
　　D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF er area
　　E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
　　i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
　　
　　Gateway of last resort is 161.44.192.2 to network 198.10.1.0
　　
　　161.44.0.0 255.255.255.0 is subnetted, 1 subnets
　　C 161.44.192.0 is directly connected, Ethernet0
　　S 161.44.0.0 255.255.0.0 [1/0] via 161.44.192.0
　　S* 198.10.1.0 [1/0] via 161.44.192.2
　　171.70.0.0 is variably subnetted, 2 subnets, 2 masks
　　S 171.70.0.0 255.255.0.0 [1/0] via 171.70.24.0
　　S 171.70.24.0 255.255.255.0 [1/0] via 131.108.99.2
　　131.108.0.0 255.255.255.0 is subnetted, 1 subnets
　　C 131.108.99.0 is directly connected, TokenRing0
　　
　　
　　Flagging a Default Network
　　Note: The ip default-network command is ful, which means the router has a route to the subnet indicated by this command, it s the route to the major net. At this po neither network has been flagged as the default network. The ip default-network command must be issued again, using the major net, in order to flag the candidate default route.
　　
　　2513#config terminal
　　Enter configuration commands, one per line. End with CNTL/Z.
　　2513(config)#ip default-network 171.70.0.0
　　2513(config)#^Z
　　
　　2513#show ip route
　　Codes: C - connected, S - , I - IGRP, R - RIP, M - mobile, B - BGP
　　D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF er area
　　E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
　　i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
　　
　　Gateway of last resort is 161.44.192.2 to network 198.10.1.0
　　
　　161.44.0.0 255.255.255.0 is subnetted, 1 subnets
　　C 161.44.192.0 is directly connected, Ethernet0
　　S 161.44.0.0 255.255.0.0 [1/0] via 161.44.192.0
　　S* 198.10.1.0 [1/0] via 161.44.192.2
　　171.70.0.0 is variab