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I just recently switched over from pfSsense as I saw and like the more open and active development of opnsense.

Now I have a Multi-Wan setup with a DSL line and and LTE modem. Wan (1) with DSL works fine just as expected. But I have severe problems with the LTE modem. It is a Netgear LB1111 in bridge mode on WAN2. Already had another thread because of the DHCP settings on the LTE modem causing problems in opnsense, because the netmask was set to /32 and the gateway was x.x.x.1 and therefore outside the subnet. That was fixed by using static IP4 settings.

However the LTE line causes problems whenever a new connection (like opening a website in the browser) fails like 2 out of 3 times. I have no idea what causes this, tried looking at the firewall diags and found it strange that both state stats and state dump are completely empty.

Is there a way to trace problems like that (maybe from the command line)?

the same setup (dsl and lte) was working fine for years on pfsense, but I would really like to switch over and stay with opnsense.

edit/update with more info:

long standing connections work just fine (like a webradio stream plays fine for hours), but new connections fail quite often: just clicking on different articles on a webpage fails to connect or times out a lot.

I don't know if it's a problem with the LTE modem or the LTE "line", as I don't have another LTE modem to test with. The problem occurs whenever the LTE line is active: in multi-wan and also when I disable the DSL line and have only the LTE gateway active.

dpinger/gateway logs don't show anything out of the ordinary.

DId some more testing and the problem also occurs with only the DSL line active, but just less often. Like 1 out of 5 or 10 connections fail.

All this is with a new 19.1.4 setup (also tried the update to 19.1.5_1, same results).

Yeah it is a bit silly -- but apparently other OSs (and even pfSense) seem to work fine anyway without having to set extra options... So opns behaves correctly strictly speaking, while the others do not.

thanks for the fast reply and solution!

hmm, you are correct. WAN2 is a 4G LTE modem in bridge mode with DHCP configuration from the 4G network provider... apparently the DHCP server on the mobile network sets the gateway outside the submask...

Since I have a fixed IP for that network I setup the interface as static IP now, and it works right away.

So is using the "Far GW" option the correct way to handle cases like that, or am I better off with the "static" IP setup (which would break if the gateway address on the mobile network ever changes).

Long time PC based router user here, after m0n0wall and the other -sense I decided to switch over to OPNsense. All basic functions are working, but I cannot get Multi WAN to work (was working fine on the previous system).

The second gateway is always marked as down, and the gw log shows repeated entries of:

dpinger: WAN2_DHCP 8.8.4.4: sendto error: 22

and the general log shows that error message for the interface:

kernel: arpresolve: can't allocate llinfo for 77.119.x3.x on igb1

no matter what monitor IP I use.

The interface for WAN2 is up, and is assigned an IP and gw address via DHCP.

The first WAN uses a static IP network, and is working fine.

More system info:

OPNsense 19.1.4-amd64

WAN2 interface (opt1, igb1)
Status    up
DHCP    
up 
MAC address    40:62:31:01:xx:xx
IPv4 address    77.119.x3.x5
Subnet mask IPv4    32
Gateway IPv4    77.119.x3.1

I followed the guide from https://wiki.opnsense.org/manual/how-tos/multiwan.html and already know the setup from the earlier -sense system where I had the exact same multiwan setup working.

Any pointers here? Can't seem to find any info on the sendto error 22 (besides low level programming errors using wrong address structs).

thanks!