Configuring a Dialer Filter for USB Modem Dial Backup

Navigate to the Firewall level in the configuration hierarchy.

1. In the J-Web interface, select Configuration>Edit Configuration>View and Edit.
2. Next to Firewall, click Edit.

From the [edit] hierarchy level, enter

edit firewall

Configure the dialer filter name—for example, interesting-traffic.

1. Next to Inet, click Configure or Edit.
2. Next to Dialer filter, click Add new entry.
3. In the Filter name box, type interesting-traffic.

1. Enter

   edit family inet

2. Then enter

   edit dialer-filter interesting-traffic

Configure the dialer filter rule name—for example, term1.

Configure term behavior. For example, you might want to configure the dialer filter to allow only traffic between the branch office router and the head office router over the backup USB modem connection. In this example, the branch office router has the IP address 20.20.90.4/32 and the head office router has the IP address 200.200.201.1/32.

To configure the term completely, include both from and then statements.

1. Next to Term, click Add new entry.
2. In the Rule name box, type term1.
3. Next to From, click Configure.
4. Next to Source address, click Add new entry.
5. In the Address box, type 20.20.90.4/32.
6. Click OK.
7. Next to Destination address, click Add new entry.
8. In the Address box, type 200.200.201.1/32.
9. Click OK until you return to the Term page.

1. Enter

   edit term term1

2. Enter

   set from source-address 20.20.90.4/32

3. Enter

   set from destination-address 200.200.201.1/32

Configure the then part of the dialer filter to discard Telnet traffic between the branch office router and the head office router.

1. Next to Then, click Configure.
2. From the Designation list, select Note.
3. Click OK.

Enter

set then note

Navigate to the Interfaces level in the configuration hierarchy.

1. In the J-Web interface, select Configuration>Edit Configuration>View and Edit.
2. Next to Interfaces, click Edit.

From the [edit] hierarchy level, enter

edit interfaces dl0 unit 0

Select the dialer interface to apply the filter—for example, dl0.

1. In the Interface name column, click dl0.
2. Under Unit, in the Interface unit number column, click 0.

Apply the dialer filter to the dialer interface.

1. In the Family section, next to Inet, click Edit.
2. Next to Filter, click Configure.
3. In the Dialer box, type interesting-traffic, the dialer filter configured in Configuring the Dialer Filter.
4. Click OK.

1. Enter

   edit family inet filter

2. Enter

   set dialer interesting-traffic