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Wed, Mar 01, 2017 10:42 pm

Discarding configuration changes for a Juniper SRX router/firewall

If you've been entering commands for configuration changes on a Juniper Neworks SRX router/firewall, which runs the Juniper Network Operating System, Junos OS, but haven't committed those changes to make them active, you can discard them using the command rollback 0. which will replace the "candidate config", i.,e., the one you've been editing, with the active configuration, which is also the boot configuration.
root@Alder# rollback 0
load complete


The device can store multiple prior configurations and you can revert to one of those other prior configurations, instead, using rollback n where n is the number for the prior configuration. You can also rollback to a saved "rescue" configuration with rollback rescue. You an see a list of the stored configurations to which you can revert using the command rollback ?.

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[/security/firewalls/SRX] permanent link

Wed, Feb 01, 2017 10:42 pm

Allowing the untrusted interface on a Juniper SRX router/firewall to be pinged

If you wish to allow the untrust interface, which is usually the Internet-facing interface on a Juniper Networks SRX router/firewall running the Junos operating system, to be pinged from external systems, you can use the command set security zone security-zone untrust interface ge-0/0/0.0 host-inbound-traffic system-services ping after placing the device in configuration mode with the configure command, presuming, of course, that the untrust interface is ge-0/0/0.0. If it is some other port on the router, substitute that port identifier, instead.

root@Alder> configure
Entering configuration mode

root@Alder# set security zone security-zone untrust interface ge-0/0/0.0 host-inbound-traffic system-services ping

root@Alder# commit
commit complete


Afer committing the configuration, you should be able to successfully ping the IP address of the untrusted, i.e., Internet side of the device.

[/security/firewalls/SRX] permanent link

Tue, Jan 31, 2017 11:10 pm

Creating a rescue configuration for a Juniper SRX Firewall

You can create a rescue configuration to be used in the event you make some change to a Juniper Networks SRX router/firewall, which runs Junos OS, that makes the device inaccessible. With a rescue configuration saved on the device, you can return the router/firewall to a known operational state. The rescue configuration saved on the device can provide a last resort means of quickly restoring the device to operational status. You can use either the web-based graphical user interface (GUI) method to create a saved rescue configuration via a web browser connection to the system or a command line interface (CLI) method.

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[/security/firewalls/SRX] permanent link

Thu, Jan 19, 2017 11:06 pm

Setting up a Juniper Networks SRX100 Router/Firewall

You can configure a Juniper Networks router/firewall, such as a Dell J-SRX100H, which is manufacturered by Juniper Networks by connecting a network cable between one of the 0/1 through 0/7 ports on the SRX100; don't use the 0/0 port, because that is the default port for the "untrusted" side of the device, i.e., for connections on the "outside" or Internet-facing side of the device. If you have the connected device set to obtain an IP address by the Dynamic Host Configuration Protocol (DHCP), it will be assigned an address from the subnet, You can then log into the router by opening a browser window and pointing the browser to

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[/security/firewalls/SRX100] permanent link

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