IKEv2 Site-to-Site and MultiWAN on one side
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I believe that I have a similar issue with the IPsec tunnel. My setup is as follow:
main office
Pfsense with Dual WAN. They are configured in a Failover group (Tier1 and 2 ). I have static public IP addresses for both of the WANs.Branch office:
Pfsense with one WAN. It has a static public IP address.I configured one tunnel in the main office that points towards the branch office from the WAN failover group. On the branch office, I set up 2 tunnels one point towards the main WAN in the main office and the other points towards the secondary WAN.
When the main WAN in the main office goes offline, The tunnel will be recreated with the secondary WAN. But when The main WAN comes back online there will be 2 active tunnels from the main and secondary WAN to the branch office. I don't know if this is an issue with my configuration since there is one tunnel in the main firewall and 2 tunnels in the other firewall, or it is only a limited configuration.
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Is there a solution for this in 2024?
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Specifically for the VPN remaining on the failover WAN?
There are options to kill states on recovery in 24.03 that weren't there 5 years ago:
https://docs.netgate.com/pfsense/en/latest/config/advanced-misc.html#state-killing-on-gateway-recovery -
@stephenw10 i mean set in ipsec tunnel a backup IP peer for when the remote ip peer is down, that pfsense connect to backup ip (or backup tunnel)
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You can use an FQDN there and have it be a DynDNS name that fails over. Or setup two tunnels.
If it's inbound you can just allow connections from any remote peer.
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@stephenw10 said in IKEv2 Site-to-Site and MultiWAN on one side:
Does it try to connect out to the wrong IP or just disallow incoming connections from the WAN it's not expecting? Or both I guess?
One thing you can do here it to set the remote gateway to 0.0.0.0/0 and use an identifier type other than IP address. That will allow connections from both WANs but the tunnel can then only ever be established from the multi-wan side.
If you do try that you should check 'Disable Auto-added VPN rules' in Sys > Adv > Firewall and add your own rules to allow the IPSec traffic in from only the two remote WAN IPs. Otherwise the auto rule will allow IPSec connections from any IP. Connections will fail as they won't have the right credentials but the logs will be filled with drive-by connection attempts, potentially.Steve
Would this configuration help to connect IPsec on the link that is tier2?
I can only connect my tunnels to the link that is tier1.
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Well if you set one side to allow traffic from any IP address (0.0.0.0/0) then connections can only be established from the other end. That would be the multiwan end. You can set a tunnel to use a backup WAN specifically if you need to.
If you set a tunnel on a failover group it will always try to use the lowest tier WAN. That can be a different group so the VPN uses a different WAN than other traffic.
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@stephenw10 said in IKEv2 Site-to-Site and MultiWAN on one side:
Well if you set one side to allow traffic from any IP address (0.0.0.0/0) then connections can only be established from the other end. That would be the multiwan end. You can set a tunnel to use a backup WAN specifically if you need to.
If you set a tunnel on a failover group it will always try to use the lowest tier WAN. That can be a different group so the VPN uses a different WAN than other traffic.
Even though I configure the backup WAN in the tunnel, it doesn't connect, I can only connect to the main WAN. I don't know if I'm forgetting some configuration.
I have 3 wans and some ipsec tunnels, I would like to balance these tunnels between the 3 wans, but I get stuck connecting them all to the main one.
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If you're not using a gateway group on the multiwan end and the other side is connecting to one of the non-default WANs by IP that should connect fine.
How does it fail? What errors are shown?
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@stephenw10 I use "gateway groups" with these wans, could that be the problem? Can't the wan belong to a gateway group?
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The existence of a gateway group should not prevent other services being set to use a specific WAN even if it's in a group.
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OK that looks like the other end is not seeing the replies for some reason.
Check the state table at both ends.
Which end are those logs from?
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@stephenw10 This is the side that has the two wans.
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Ok so it sees the incoming request on the correct WAN and replies but the other end never sees that reply because it just sends the initial request again.
So either that reply is not actually being sent or it's send incorrectly somehow. Or something in the route is blocking it.
I'd first check the state tables at each end. If that doesn't show something obvious then run a pcap at both ends to confirm replies are being sent and received.
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OK so never makes it to the firewall state at the remote end.
Run pcaps and make sure it's leaving the multiwan end correctly.
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You might also try just pinging between those sites using that WAN as source and see if it gets to the remote side as expected.
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@stephenw10
I think I found the problem. I was using this configuration:
Because I used 0.0.0.0 in remote gateway.
After I switched to, it worked.
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You should be able to use ASN at both ends as long as it all matches.
