We have had a problem for several years actually, it is coming and going and have affected two sites over the years and as I remember also ADSL and VDSL links we have had.
DHCP client looses IP address and fails to renew it, hence causing internet downtime at those sites. It usually fixes itself after random time up to 20 minutes, which is Telia lease DHCP time. I was in contact with them several time over the years regarding this, they say try with another device, we indeed did.
We have CCR1016 as our routers towards internet, and before that we have had RB333 and RB450G and also RB750 as backup device, and in old days we had some DLINK routers and also Netgears.
I say it is Telia who has the DHCP lease problems because all our different routers show same problem. Telia claim it must be something “odd” with Mikrotik and RouterOS.
Anyone here with a similar experience, did you solve it ?
I’ve got the same problem. I use an Apple Airport Extreme as router. It fails to renew the DHCP-license for a while, with the result that all outgoing traffic fails.
Ok, exactly what I wanted to hear. I have an open dialogue with telia about it and a ticket, it is on their third line now they say.
They wanted me to change to another router to see if it repeated, but I could not do that.
Again we face this dhcp client issue with telia, fails to renew IP address. Telia has 20 minute lease time what I can see and mikrotik router seems to try renew when it is about 10 minutes left lease time.
I am having an open dialogue with Telia about it, they claim it is my device who has problems, so it is up to me to prove the CCR is correct.
Our CCR1016-12G fails to renew the lease and ip address is lost, also other mikrotik devices fails to renew the lease, we tried CCR1009, RB450G, RB750G, RB600 and RB333. All of them show the same issues with renewing dhcp client ip address.
This happens several times per year, thanks not to often, but it is very annoying since in some of the cases renewal fully fails and a hard reboot is needed.
After such hard reboot it usually works.
I have not seen any dhcp client tuning parameters like renewal times and so on, it is much in to the TCP/IP protocol definitions that I strongly believe Mikrotik follows. Anyone who know about dhcp client renewal settings parameters ?
I don’t want to interfere with the builtin dhcp client renewal process, it seems to dramatical
But, one idea is to write a script that checks if renewal has failed and then first try release and renew, if that fails disable and enable the dhcp client for the interface, and if that fails bring the interface down and up, finally if that does not work either try to reboot the entire CCR.
Anyone with some suggestions or ideas around this, beside to order and add one other ISP fibre/wire to the router and use failover when this happens instead.
