Networking in Visual Studio .NET

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Net 1 Figure 9.7 Redundant routing.
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Dynamic route recovery is a good idea within your data center, or among servers that make up a large web site farm. When you re dealing with multiple networks with multiple routes between them, along with firewalls and packet filters, you want to have fine-grain control over your network topology. However, there are many cases in which you re going to have many smaller, singleoutlet networks that tie into a backbone or larger network. Managing multiple routes, or multiple default routes, on many hosts becomes a large administrative chore; driving a consistent network address failover when a router or other outlet point fails is equally more difficult as the network grows in size. Enter VRRP, which allows you to pair up routers to create virtual routers whose IP addresses migrate from a failed router to the redundant router. In Figure 9.8, each branch network is connected to redundant routers; each network knows the IP address of its preferred router as the virtual address managed by VRRP. In the event that router r2 fails, for example, VRRP will migrate the virtual IP address 192.9.231.200 to router r1, and all traffic from network 192.9.231.0 will flow to the backbone network through router r1. VRRP makes failover decisions on the basis of a master/slave relationship between router pairs, although it can also do load sharing between routers. Figure 9.8 shows two virtual IP addresses, with each router acting as a backup for the other. If desired, or required for load handling purposes, the routers can be configured to balance the load between them.
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192.9.232.0 branch net 192.9.232.200 IP r1 r2 192.9.231.200 IP 192.9.231.0 branch net 192.9.40.0 backbone net
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Figure 9.8 Virtual router interfaces.
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Routing Recovery Guidelines
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To make your network infrastructure more tolerant of routing problems, make sure that you combine routing techniques to aid recovery and early warning of problems: Avoid single-outlet networks. A network connected to the world through only one router has a single point of failure. Even using a host as a router only for emergency purposes leaves you a fallback position. Severe router problems may require several hours to trace and repair, leaving your network partitioned without the redundancy. Again, VRRP is a good answer here, but that means redundant routers at the single outlet. If you re connecting several hundred branch offices to a core network, that s several hundred redundant router pairs to operate as well. Default routes are good as long as there s more than one. Using a default route means you don t need to accept routing updates and can turn off the somewhat noisy RIP protocol on your routers. If you do this, however, make sure that you have multiple default routes (one for each possible outlet from the network). Sending packets to a default router that isn t listening is as good as being without any redundancy. While it sounds counterintuitive to have more than one default, realize that default is only used to designate the route used when no better match can be found in the routing tables. Multiple default routes mean that you have several choices of last resort, and can select the route with the best availability or capacity. Dynamic redirection is also good. Ensure that your router sends ICMP redirect messages if it s asked to forward a packet better handled by another router. Without dynamic redirection, you ll clutter your network with reforwarded packets, possibly hurting performance.
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Scripted intervention cuts down the time to repair. Aggressively monitor end-to-end connectivity, using ping or more advanced tools like traceroute that show you the path taken by a packet. You ll even find asymmetry in your routing tables using traceroute. Rather than waiting for a client to recognize a router failure and update its routing tables, use the route command to proactively flush the stale information and construct a new route. You can trim recovery times into the tens of seconds with aggressive monitoring, and also collect data to help locate the root causes of repeated router outages or problems.
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