Switching

Is there a way to clear or flush the DNS cache on EX switches?

I am moving to new DNS servers and would like to make sure the switches are resolving addresses correctly.

-Mike

try "clear system services dns-proxy cache"

or go to bsd shell and do "ndc restart"

or reboot the switch ...

regards

"clear system services dns-proxy cache"

 --- there is no option for dns-proxy, I only have clear system dhcp

or go to bsd shell and do "ndc restart"

 --- Command not found.

or reboot the switch ...

 --- not a great option, but is this my only option?

Strange - I can't find any command either.  Do you know that the EX caches DNS responses?

It looks like edit mode cli ping is resolving correctly without a reboot, but BSD shell is not.

The only thing that I can find an entry for on the Juniper KB for DNS cache is for Netscreen and SRX firewalls which can perform a DNS proxy function.

It doesn't make sense that a switch would perform DNS caching when you think about it.

You should be able to point the switch at the new DNS server(s) without a reboot and the switch will resolve anything you ask of it against these new servers.

The /etc/resolv.conf file handles DNS resolution in the BSD shell and on my test EX systems the values here match what my switch is configured to do as far as the DNS domain name to add, DNS servers, etc.

I did some more testing and it looks like the switch isn't caching after all.

Thanks,

Mike