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LtAP mini LTE passthrough+ no internet

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brg3466
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Posts: 177
Joined: Sat Aug 01, 2015 7:29 am

LtAP mini LTE passthrough+ no internet

Mon May 23, 2022 1:38 am

Hello everyone,
I have a LtAP mini LTE-US and it works perfectly with AT&T sim card in normal mode. ( means non-passthrough).
Recently, I played with it for passthrough mode. I connected a mAP to it and I cann't get internet.

What I did:
1. on LtAP mini, I created two vlan on ether1 - vlan2 for access, and vlan3 for ip passthrough.
2. on mAP, I created two vlans on ether1- vlan2 as management and put it on the local bridge with ports ether2, vlan3 for internet. And activate the dhcp-client on vlan3.

I can see that mAP get the IP address of 10.x.x.x /30 from the passthrough, but there is no internet. I noticed that there is no traffic on lte1 interface. the modem in LtAP mini is R11e-LTE-US.

What I am missing on the configuration ?

LtAP mini config
Code: Select all
# may/21/2022 21:56:48 by RouterOS 7.2.3
# software id =
# model = RouterBOARD 912R-2nD-LTm

/interface lte
set [ find ] name=lte1

/interface vlan
add interface=ether1 name=vlan2-mgmt vlan-id=2
add interface=ether1 name=vlan3-passthrough vlan-id=3
/interface lte apn
set [ find default=yes ] apn=broadband name=att passthrough-interface=\
    vlan3-passthrough passthrough-mac=auto

/ip dhcp-client
add interface=vlan2-mgmt
/ip dns
set allow-remote-requests=yes servers=8.8.4.4
/system identity
set name=LtAP

/tool romon
set enabled=yes


mAP config
Code: Select all
# model = RBmAP2nD

/interface bridge
add name=bridge-local

/interface vlan
add interface=ether1 name=vlan2-mgmt vlan-id=2
add interface=ether1 name=vlan3-Internet vlan-id=3

/ip pool
add name=dhcp_pool1 ranges=10.10.59.20-10.10.59.50
/ip dhcp-server
add address-pool=dhcp_pool1 interface=bridge-local name=dhcp1

/interface bridge port
add bridge=bridge-local interface=ether2
add bridge=bridge-local interface=vlan2-mgmt

/ip address
add address=10.10.59.1/24 interface=ether2 network=10.10.59.0

/ip dhcp-client
add interface=vlan3-Internet

/ip dhcp-server network
add address=10.10.59.0/24 gateway=10.10.59.1

/ip dns
set allow-remote-requests=yes servers=8.8.4.4
/ip firewall nat
add action=masquerade chain=srcnat
/system identity
set name=mAP

/tool romon
set enabled=yes
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hecatae
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Posts: 244
Joined: Thu May 21, 2020 2:34 pm

Re: LtAP mini LTE passthrough+ no internet

Tue May 24, 2022 6:29 pm

Hi,

Are you using SIM slot up or down aka a or b?
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brg3466
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Joined: Sat Aug 01, 2015 7:29 am

Re: LtAP mini LTE passthrough+ no internet

Tue May 24, 2022 7:47 pm

I am using the "down" sim card slot. Will that make a difference ? I will try to put sim card in "up" slot.
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brg3466
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Posts: 177
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Re: LtAP mini LTE passthrough+ no internet

Tue May 24, 2022 10:10 pm

@hecatae, I tried , but still doesn't work.
Code: Select all
[brg3466@LtAP] > /interface/lte/settings/print
           mode: auto
  firmware-path: firmware
       sim-slot: up
after the LTE interface up and running, it assigned an ip address 10.142.201.230/30 to the mAP, and LtAP itself got ip address 10.142.201.229/30 as well. But there is still no internet.
Code: Select all
[brg3466@LtAP] > /log pr
 22:03:28 system,info router rebooted
 22:03:30 system,info RoMON configuration changed by admin
 22:03:30 system,info Mode Button configuration changed by admin
 22:03:30 interface,info vlan2-mgmt link up
 22:03:30 interface,info vlan3-passthrough link up
 22:03:31 interface,info ether1 link up (speed 100M, full duplex)
 22:03:35 dhcp,info dhcp-client on vlan2-mgmt got IP address 10.10.59.50
 22:03:36 system,info,account user brg3466 logged in from 10.10.59.48 via winbox
 22:05:08 lte,info lte1: registered home
 22:05:14 lte,info lte1 apn: broadband found peer: 48:8F:5A:F2:C0:6E
 22:05:14 interface,info lte1 link up
 22:05:14 interface,info lte1 link down
 22:05:14 interface,info lte1 link up
 22:05:19 dhcp,info att assigned 10.142.201.230 for 48:8F:5A:F2:C0:6E mAP
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Zacharias
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Location: Greece

Re: LtAP mini LTE passthrough+ no internet

Tue May 24, 2022 10:55 pm

Code: Select all
/ip address
add address=10.10.59.1/24 interface=ether2 network=10.10.59.0
Change it to
Code: Select all
/ip address
add address=10.10.59.1/24 interface=bridge-local network=10.10.59.0
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SiB
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Re: LtAP mini LTE passthrough+ no internet

Wed May 25, 2022 12:32 am

When you confirm that Zacharias write you a solution, please mark his answer as Solution.
btw, please add in passthrough mac-address of mAP vlan3-Internet. This help when ISP change IP who will be forward to mAP.
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brg3466
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Re: LtAP mini LTE passthrough+ no internet

Wed May 25, 2022 3:24 am

@Zacharias, @SiB, thank you for pointing out the minor mistake on the /ip address. I corrected it. But it still doesn't work.
On LtAPmini, the vlan2-mgmt got ip from mAP DHCP is 10.10.59.50 and vlan3-passthrough got IP of 10.120.165.173/30
On mAP, the vlan3-internet got ip of 10.120.165.174/30.

Neither LtAP nor mAP can ping 8.8.8.8 Seems there is some issues in the route. Packets from mAP will go to 10.120.165.173, and then on LtAP, the gateway is 10.10.59.1. which is a loop.
If I set dhcp-client on LtAP vlan2-mgmt without "add default route", then only "dst-address 10.20.165.172/30 gateway=vlan3-passthrough" will stay and still no route out.
Code: Select all
[brg3466@mAP] > /ip route pr
Flags: D - DYNAMIC; A - ACTIVE; c, d, y - COPY
Columns: DST-ADDRESS, GATEWAY, DISTANCE
    DST-ADDRESS        GATEWAY         DISTANCE
DAd 0.0.0.0/0          10.120.165.173         1
DAc 10.10.59.0/24      bridge-local           0
DAc 10.120.165.172/30  vlan3-Internet         0

[brg3466@LtAP] > /ip route pr
Flags: D - DYNAMIC; A - ACTIVE; c, d, y - COPY
Columns: DST-ADDRESS, GATEWAY, DISTANCE
    DST-ADDRESS        GATEWAY            DISTANCE
DAd 0.0.0.0/0          10.10.59.1                1
DAc 10.10.59.0/24      vlan2-mgmt                0
DAc 10.120.165.172/30  vlan3-passthrough         0



The lastest config of LtAP ( add mac-address of mAP vlan3 to the APN ):
Code: Select all
/interface lte
set [ find ] name=lte1

/interface vlan
add interface=ether1 name=vlan2-mgmt vlan-id=2
add interface=ether1 name=vlan3-passthrough vlan-id=3
/interface lte apn
set [ find default=yes ] apn=broadband name=att passthrough-interface=vlan3-passthrough passthrough-mac=48:8F:5A:F2:C0:6E

/interface lte settings
set sim-slot=up
/ip dhcp-client
add interface=vlan2-mgmt
/ip dns
set allow-remote-requests=yes servers=8.8.4.4
/system identity
set name=LtAP

/tool romon
set enabled=yes
config of mAP
Code: Select all
# may/21/2022 23:17:21 by RouterOS 7.2.3
# model = RBmAP2nD

/interface bridge
add name=bridge-local

/interface vlan
add interface=ether1 name=vlan2-mgmt vlan-id=2
add interface=ether1 name=vlan3-Internet vlan-id=3

/ip pool
add name=dhcp_pool1 ranges=10.10.59.20-10.10.59.50

/ip dhcp-server
add address-pool=dhcp_pool interface=bridge-local name=dhcp1

/interface bridge port
add bridge=bridge-local interface=ether2
add bridge=bridge-local interface=vlan2-mgmt

/ip address
add address=10.10.59.1/24 [b]interface=bridge-local[/b] network=10.10.59.0

/ip dhcp-client
add interface=vlan3-Internet

/ip dhcp-server network
add address=10.10.59.0/24 gateway=10.10.59.1

/ip dns
set allow-remote-requests=yes servers=8.8.4.4

/ip firewall nat
add action=masquerade chain=srcnat
/system identity
set name=mAP

/tool romon
set enabled=yes
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SiB
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Location: Poland

Re: LtAP mini LTE passthrough+ no internet

Sat May 28, 2022 1:36 am

brg3466 write:
If I set dhcp-client on LtAP vlan2-mgmt without "add default route", then only "dst-address 10.20.165.172/30 gateway=vlan3-passthrough" will stay and still no route out.
You should focus on mAP and use tracerout to try find why it's not use proper route... .
LtAP can have disable this "add default route" for now until the passthrough give you a proper internet.

Seams all ok, LtAP not use masquarade/snat but mAP use it for his clients.
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