When an SRX is your wan facing router/firewall you might want to continuously test your connectivity. That is when the RPM probes do come in handy. The RPM probes are very similar to ip-sla from cisco but way more limited. On their own they just provide statistics which is nice but not very helpful. Juniper also has a feature called ip-monitoring that works in conjunction with the rpm probes and can take a result of an rpm probe and take some action on it.
The ex3300 has a feature out of the box which is that specific ports are by default used for virtual chassis function. This might be handy in some situations but most of the time it is annoying and bit obscure. This short article will explain how to disable this feature completely and permanently.
So it is a 10 years anniversary of this blog and with it there is a new challenges ahead. Due to series of unfortunate events I have lost all the content of this blog and all its backups. Though it is quite painful to see 10 years of one’s work gone I see it also as an opportunity for a fresh start. So what going to happen here next ? Well I have couple of things I would like to write about which I haven’t so far so that will be the new content.
Lately there has been yet again a big surge of interest in IPv6 and I did find to my surprise that even thought IPerf supports IPv6 for quite some time no-one actually has written how to actually do this rather trivial test.
First thing about IPv6 is that your interface on the end-point PCs will auto-assign a link-local address to itself. The link local address is in fe80::macaddress format (where one bit of the mac address can be changed depending on the implementation). So this looks fine – no problems. You should be able to ping between those ip addresses using ipv6 ping riight? Lets try to ping localhost’s ipv6 link-local address. In order to do this you need to specify the interface you are using as ping can’t lookup the address automatically as it can with IPv4.
In the previous par I have described how to build your own packet from L2 to L4 but what if you need something else ? maybe not a single packet but a burst of packets? or what is you need to send multiple streams of various frames ? Well then you need to use the Gen-S and Gen-B modes.