CARP not working, IP Alias does ( solved : problem switch )
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So we currently have 3 ISP, each with its own pfsense router.
each ISP have 2 pfsense box for fail safe, both have Public IP CARPs
We have no problems whatsoever with these 2 ISP.Now there is this new ISP, we're using fiber modem on our premise.
I tried to add IP CARP on this pfsense box, but it can not be reached from outside. using tcptraceroute stop at some of the ISPs router.
Then I tried to change the mode to IP Alias.... it worked, not sure why.What should I ask from the ISP about it ?
I prefer CARP because we need to have failsafe when one box goes down.P.S : All pfsense are in virtualized environment ( KVM ).
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@nicknuke
The router has to allow MAC changes in short.When a device requests the MAC for the CARP VIP pfSense gives back the virtual MAC. Then the device sends its packets to this virtual MAC.
However, when pfSense sends a packet to the device, it uses it's real interface MAC. -
@viragomann
Thanks for the insight..
I happened to be able to log in to the router's admin mode. I think it's an ONT device.But, I suppose it does not make any difference ?
I have to ask the ISP to configure it higher up on their router, am i correct ? -
@nicknuke Per https://docs.netgate.com/pfsense/en/latest/troubleshooting/high-availability.html#other-switch-and-layer-2-issues you could try a switch between pfSense and the ISP router.
Any particular reason you are using 6 pfSense routers and not two with 3 WANs each?
https://docs.netgate.com/pfsense/en/latest/recipes/high-availability-multi-wan.html -
@SteveITS
Thanks for the reply..
I'm using a HP L2 switch, I have checked it and the only security option is Storm Control, and it is unchecked.
Other 2 ISP are also plug in to the same switch, and the Carp is working. It's just this one ISP from their ONT modem, to this same switch and the carp on pfsense does not work. ( Other 2 ISP are just LAN cable since the ISP is in the same building )Actually the 2 ISP is our old ones.. they're in 2 master/slave pfsense router with CARP. pfsense is a kvm guest.
Created another 2 pfsense master/slave just for this new ISP, so i can debug this without breaking another 2 ISP currently being used by users. -
It turned out it's faulty switch...
Replaced it and all well..
Sorry for the trouble and thanks for all suggestions !