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Routing and Firewalls
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to delete routes explicitly for security purposes. You should be aware, though, that except for interface changes, the routing daemon may not respond to any modifications to the routing table that may have been enacted manually. It is best to shut down the routing daemon first before making changes, and then restart it after all changes have been initiated.
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Adding Host Routes
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To add a direct route to another host, you use the route command with the following syntax:
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route add -host destination_ip local_ip -interface interface
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Thus, if you wanted to add a route between the local host (e.g., 204.12.17.1) and a host on a neighboring class C network (204.12.16.100), for the primary interface hme0, you would use the following command:
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add -host 204.12.16.100 204.12.17.1 -interface hme0
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To add a direct route to another network, you use the route command with the following syntax:
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route add -net destination_network_ip local_ip" netmask mask
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If you wanted to add a route between the local host (e.g., 204.12.17.1) and the same network as for the host in the preceding section (204.12.16.0), for the class C netmask (255.255.255.0), you would use this command:
route add -net 204.12.16.0 204.12.17.1 -netmask 255.255.255.0
Adding a Default Route
To add a default route, you can use the route command with the following syntax:
route add default hostname interface interface
For example, to add a default route to a local router (204.54.56.1) for a secondary interface hme1, you can use the following command:
route add default 204.54.56.1 -interface hme1
Part V:
Networking
Dynamic Routing
In this section, we will look more closely at the RIP and RDISC dynamic routing protocols. A prerequisite for dynamic routing to operate is that the /etc/defaultrouter file must be empty.
routed
in.routed is the network routing daemon and is responsible for dynamically managing entries in the kernel routing tables. It is usually started from a line during multiuser boot (/etc/rc2.d/S69inet) using the following command:
/usr/sbin/in.routed -q
The routing daemon uses UDP port 520 to route packets and to establish which interfaces are currently Up and which are Down. in.routed listens for requests for packets and for known routes from remote hosts. This supplies hosts on a network with the information they need to determine how many hops to a host. When it is initialized, the routing daemon checks both gateways specified in /etc/gateways. It is also possible to run the routing daemon in a special memory-saving mode that retains only the default routes in the routing table. While this may leave a system at the mercy of a faulty router, it does save memory and reduces the resources that in.routed requires to maintain lists of active routes that are periodically updated. This can be enabled by initializing in.routed with the S parameter.
RDISC
The RDISC daemon uses the ICMP router discovery protocol and is usually executed on both hosts and routers at boot time, at which time routers broadcast their availability and hosts start listening for available routers. Routers broadcast their availability using the 224.0.0.1 multicast address. Routers that share a network with a host are selected first as the default route, if one is found. Another approach is for the host to send out a broadcast on the 224.0.0.2 multicast address, to solicit any available routers. In either case, if a router is available, it will accept packet forwarding requests from the host concerned.
Configuring the IPFilter Firewall
IPFilter is a popular freeware packet-filtering package for Solaris. It is a kernel-loadable module that is attached at boot time. This makes IPFilter very secure, because it cannot be tampered with by user applications. However, as you will read in this section, this approach also has problems, because loading unstable modules into the kernel can cause a Solaris system to crash. Solaris 10 now ships with the packages SUNWipfr and SUNWipfu, with updates available from http://coombs.anu.edu.au/~avalon/. The first step in creating an IPFilter configuration file is to consult with users and managers to determine a list of acceptable services. Many companies already have an acceptable-use policy that governs which ports should be available and what permissions should be given for user-initiated services. After you determine a list of ingoing and
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