Managing Junos Commit Time

17 09 2015

I’ve been working with an ISP that is going to be using a large amount of configuration in the ‘groups’ section.  The statements there will be inherited into the main configuration using the ‘apply-groups’ statement.

This is a clever way of writing commands once and having them apply to multiple parts of the configuration.  At a basic level you could match on interfaces beginning with ‘ge-‘ or ‘xe-‘ and set an MTU on them all using one group statement. This MTU setting would not appear in the main configuration unless the configuration was displayed using “show | display inheritance”. There’s a nice explanation of how groups work over at this Packetpushers blog.

The downside is that if large amounts of configuration work is done in groups, applying the config can become slow during the ‘commit’ process.   Read the rest of this entry »

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Networking Heresy?

14 09 2015

Software Defined Networking, and it’s latest incarnation SD-WAN seem to be all the rage at the moment.  Having seen presentations from vendors large and small on the subject recently at Networking Field Day 10 I am still given to thinking there are a few things that get glossed-over by the vendors quite often.  Foremost in my mind, is this (potentially heretical thought): Read the rest of this entry »





Another useful SRX command for looking at IPSec tunnels

12 08 2015

This is a new one on me – obviously I’ve not been paying much attention since it has been around since 10.2!

On 12.1X45-D15.5 the counters for packets/bytes all show zero, but at least you can see that your tunnel is up and what the various parameters in use are…  See below: Read the rest of this entry »





Useful SRX debugging blog

12 08 2015

Just came across a useful debugging guide for site-to-site IPSec VPNs on Juniper SRX. It is a bit confusing because in steps 2 and 3, where it says [LOCAL PEER IP] it should actually say [REMOTE PEER IP].   But otherwise, this is a very useful set of instructions. Read the rest of this entry »





A nice SRX command I’ve never come across before

11 08 2015

Not sure why this command has to be so obscure, but I stumbled on this while writing a training course tonight – quite a nice way to see if packets are hitting your policies:

imtech@srx220-1-POD3> show security policies hit-count 
Logical system: root-logical-system
 Index   From zone        To zone           Name           Policy count
 1       VR3a             VR3b              P1             0            
 2       VR3a             untrust           3to1VPN        8320         
 3       VR3a             untrust           P1             3249         
 4       VR3b             VR3a              P1             0            
 5       VR3b             untrust           P1             0            
 6       untrust          junos-host        P1             8            
 7       untrust          VR3a              1to3           5523         
 8       untrust          VR3a              P1             5            
 9       untrust          VR3b              permit-to-3b   0            
 10      untrust          VR3b              DEFAULT-DENY   16




Junosphere – inaccessible VMXes

24 07 2015

Update:  The problem described in this article was logged with JTAC.  It took a while but eventually they informed me they had resolved an issue with provisioning VMX in the Junosphere system.  I have tried it since and the issue does appear to have gone away.  However I am leaving this post up in case it has simply become more intermittent.   Please let me know if you experience a situation like what is described below.

I usually use the ‘experimental’ VMX in my Junosphere topologies because I don’t like the VJX all that much.  The VJX has security code in it, so it’s not quite like an MX really.   Also I’ve seen oddities where it came up in flow mode with a default firewall policy of denying everything, and I was never able to work out why.

So instead I use the VMX for everything – which is better these days because it doesn’t use two VM units for the data and control planes like it used to.  Why VMX is still ‘experimental’ after so long is a mystery to me.

However one thing just keeps cropping up with this that is just a bit annoying.   Read the rest of this entry »





Junos Space backup location

30 06 2015

Just a note for future reference: Read the rest of this entry »