Author: rtoodtoo

Worked for more than 10 years as a Network/Support Engineer and also interested in Python, Linux, Security and SD-WAN // JNCIE-SEC #223 / RHCE / PCNSE

Changes bringing interface down in Junos

I don’t know if there is any comprehensive list of changes which brings down an interface apart from specifically disabling the interface. So far I recall two of them which are striking and might not be expected to flap interface. If anyone has also experience, it might be a good place to share. per-unit-scheduler Years
Read More »

error: put-file failed on Junos

I have got the following error while I was trying to copy a file via SCP on Junos. As per the error, I thought it is something to do with my local permissions but I could read the source backup.conf file. I searched online, numerous entries showed up. yilmaz@host> file copy backup.conf scp://yilmaz@ yilmaz@'s password:
Read More »

SSH client preference

There are various SSH clients for Windows platforms and up until couple of months ago I was thinking that the best SSH client for me was SecureCRT but I discovered another one called Mobaxterm. This product really took my attention, primary reason of which is the richness of the feature set. Fist look at what
Read More »

Slow file transfer and TCP Zero Window Probe

Slow file transfers must be really bothering everyone. I have a ZyXEL NSA325 NAS device which has a gigabit interface but I am getting extremely low throughput. Unfortunately this has been a problem I think since I bought this device. Now I could finally get hold of time to troubleshoot the issue. Here is my
Read More »

OSPF route withdraw

OSPF has slightly different way of removing routes compared to BGP. On this short post, I will present how a link failure is propagated to other routers on OSPF domain. For this test, I have the following topology section in which AREA3 is connected to AREA0 and we simulate a link failure on the Junos
Read More »

BGP Route Refresh in JUNOS

What happens when you change a BGP import routing policy in your neighbor configuration? Changes take effect immediately or we need to issue the soft-inbound command to request the routes? Let’s see by an example. We received the route from already as you see below. root@J29> show route protocol bgp terse inet.0:
Read More »