Category Archives: Networking

Destination NAT (port forwarding, PAT, NAPT) on Juniper SRX series

There will be cases when a static 1:1 NAT from an external IP to an Internal IP is not applicable, for instance when there is only one IP available for your Juniper SRX device or when there are more internal … Continue reading

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Using MF filters to perform CoS based on prefixes in a SRX or J series router

If you have a J series or SRX and have some networks downstream that should equally or unequally share an Internet resource. And you dont care about sorting traffic on layer 4 or using standard DSCP classification. It is enough … Continue reading

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Using SRX and J series as a packet based router instead a flow based firewall

When using SRX or J series in the network it most of the time serves as a firewall or secure router. But sometimes it is used just like a L3 CPE with routing and/or MPLS. Disable flow forwarding and fall … Continue reading

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Using apply-path in JUNOS config to create dynamical prefix lists under policy options

Have you faced the problem that you would like to build prefix lists to protect your route engine or CPU in SRX/J-series that consists of elements that also exists elsewhere in the configuration? Would’nt it be nice to actually only … Continue reading

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Secrets of load sharing traffic on Juniper devices with IGP,BGP and MPLS part 1

To have traffic evenly load shared or even in certain scenarios have the traffic unevenly load shared can be little of a secret that now will be demystified and revealed in a series of articles. Scenario 1, load sharing traffic … Continue reading

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Switching on Juniper SRX series

On the Juniper Secure Router series SRX, the X stands for switching. And there is a very good switching feature set implemented on the SRX. It has all the features you need like normal VLAN switching and separation, 802.1Q trunking … Continue reading

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Jumbo frames for L2 and L3 environments on Juniper EX series switches

When there is a need to use jumbo frames for switching and optionally routing on a EX series switch from Juniper there are a few things to observe to make it work correctly. (Follwing example is tested with JUNOS 11.4 … Continue reading

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