01-firewall web configuration manual-5pw100-static route configuration

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Table of Contents

1 Static Route Configuration 1-1

Static Route Overview 1-1

Static Route 1-1

Default Route 1-1

Application Environment of Static Routing 1-1

Configuring Static Route 1-2

Static Route Configuration Example 1-3


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1 Static Route Configuration

The term router in this document refers to both routers and Layer 3 switches.

Static Route Overview

Static Route

A static route is manually configured to forward matching IP packets.

If a networks topology is simple, you only need to configure static routes to implement network

communication. The proper configuration and usage of static routes can improve network performance

and ensure bandwidth for important network applications.

The disadvantage of using static routes is that they cannot adapt to network topology changes. If a

fault or a topological change occurs in the network, some static routes will be unreachable. In this case,

the network administrator has to modify the static routes manually.

Default Route

Without a default route, a packet matching no routing entry is discarded and an ICMP

destination-unreachable packet is sent to the source.

A default route is used to forward packets that match no entry in the routing table. It can be configured

in either of the following two ways:

The network administrator can configure a default route with both destination and mask being

0.0.0.0. The router forwards any packet whose destination address fails to match any entry in the

routing table to the next hop of the default static route.

Some dynamic routing protocols, such as OSPF, RIP and IS-IS, can also generate a default route.

For example, an upstream router running OSPF can generate a default route and advertise it to

other routers, which install the default route with the next hop being the upstream router.

Application Environment of Static Routing

Before configuring a static route, you need to know the following concepts:

1) Destination address and mask

While configuring a static route, specify both the destination IP address and mask in dotted decimal

format.2) Output interface and next hop address


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While configuring a static route, you can specify either the output interface or the next hop address

depending on the specific occasion. The next hop address can not be a local interfaces IP address;

otherwise, the route configuration will not take effect.

In fact, all the route entries must have a next hop address. When forwarding a packet, a router first

searches the routing table for the route to the destination address of the packet. The system can find

the corresponding link layer address and forward the packet only after the next hop address isspecified.

When specifying the output interface, note that:

If the output interface is a Null 0 or loopback interface, there is no need to configure the next hop

address.

If the output interface is a point-to-point interface, there is no need to configure the next hop

address. You need not change the configuration even if the peers address changes. For example,

a PPP interface obtains the peers IP address through PPP negotiation, so you need only specify

the output interface.

If the output interface is an NBMA or P2MP interface, which support point-to-multipoint network,

the IP address to link layer address mapping must be established. Therefore, it is recommended

to configure both the next hop IP address and the output interface.

You are not recommended to specify a broadcast interface (such as an Ethernet interface, virtual

template, or VLAN interface) as the output interface, because a broadcast interface may have

multiple next hops. If you have to do so, you need to specify the corresponding next hop for the

output interface.

3) Other attributes

You can configure different priorities for different static routes so that route management policies can

be applied more flexibly. For example, specifying the same priority for different routes to the same

destination enables load sharing, while specifying different priorities for these routes enables route

backup.

Configuring Static Route

Select Network > Routing Management > Static Routing from the navigation tree to enter the static

route configuration page, as shown in Figure 1-1 . Click Add to enter the static route configuration page,

as shown in Figure 1-2 .

Figure 1-1 Static route configuration page


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Figure 1-2 Create a static route

Table 1-1 describes the static route configuration items.

Table 1-1 Static route configuration items

Item Remarks

Destination Type the destination IP address in dotted decimal notation

Mask Type the destination IP address mask

Next Hop Type the next hop IP address in dotted decimal notation

Interface Type the outbound interface

PriorityType the static route priority

The static route priority defaults to 60.

Static Route Configuration Example

Network requirements

Configure IP addresses and masks for the interfaces and hosts as shown in Figure 1-3 . It is required to

configure static routes between the hosts so that any two hosts can communicate with each other.


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Figure 1-3 Network diagram for static route configuration

Configuration considerations

1) On Device A, configure a static route to Device B.

2) On Device B, configure two static routes to Device A and Device C, respectively.

3) On Device C, configure a static route to Device B.

Configuration procedure

1) Configure IP addresses of hosts and gateways.

As shown in Figure 1-3 , configure IP addresses of the hosts, and configure the default gateways of

Host A, Host B and Host C as 1.1.2.3, 1.1.6.1 and 1.1.3.1, respectively. The configuration procedure is

omitted.2) Configure IP address of the interfaces and security zones (omitted).

3) Configure static routes.

# Configure a static route on Device A.

Select Network > Routing Management > Static Routing from the navigation tree of Device A

and click Add to perform the following configurations as shown in Figure 1-4 .

Figure 1-4 Configure a static route on Device A

Type 0.0.0.0 as the destination IP address.


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Select 0.0.0.0 from the mask drop-down list.

Type 1.1.4.2 as the nexthop.

Click Apply .

# Configure static routes on Device B.

Select Network > Routing Management > Static Routing from the navigation tree of Device B

and click Add .




Click Apply .

Click Add .




Click Apply .

# Configure a static route on Device C.

Select Network > Routing Management > Static Routing from the navigation tree of Device C

and click Add .




Click Apply .Configuration verification

# Ping Host A on Host B (suppose the host runs Windows XP).

C:\Documents and Settings\Administrator>ping 1.1.2.2

Pinging 1.1.2.2 with 32 bytes of data:

Reply from 1.1.2.2: bytes=32 time=1ms TTL=128




Ping statistics for 1.1.2.2:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 1ms, Maximum = 1ms, Average = 1ms

# Traceroute Host A on Host B (suppose the host runs Windows XP).

C:\Documents and Settings\Administrator>tracert 1.1.2.2

Tracing route to 1.1.2.2 over a maximum of 30 hops

1


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3 1 ms