Started improperly, the SRX will tell the source node that it needs to Mean? Well, it basically means that if a session has timed out or is SYN packet that doesn’t already match an existing session. TCP-RST will send a RESET packet for any non-TCP
The most importantįeature is called TCP-RST. Once a new zone has beenĬreated there are a few features that can be turned on. [edit set zones security-zone accounting-dept Let’s create a new security zone: edit security
Than a generic name such as “Trust” when an administrator returns to this zone “accounting-dept” or even “Dept-A.” This will be far more user-friendly This would be calling the accounting department network segment Names describing their role and placement in the network. Trust zone, the Untrust zone, and the junos-global zone. Any of these steps might result in the packetīeing dropped, even before security policy evaluation.īy default, three security zones come preconfigured on the SRX: the Route lookup, and finally, a route lookup to determine theĭestination security zone. Three actions: a screen check (detailed in Chapter 6), a In fact, before theįirewall can do a security policy evaluation for a flow, it must perform Must perform a route lookup to determine the destination zone contextīefore it can examine the correct security policies. The SRX is a zone-based firewall, meaning that all security policiesĪre associated with zones and those zones are tied to interfaces. Why does the security policy lookup take place after so many other
Figure 4-1. Where policy evaluation in the SRX packet flow takes