[Solved] Q: AVM FB7530 LAN1 as WAN

Installing and Using OpenWrt
1

Hello,
in pre-preparation of my forthcoming change from VDSL to GPON fiber i'm pondering about the necessary changes in the network config.
To make the transfer as smooth as possible (family, you know) i'd like to have the config ready before i'm going to switch everything.
Could please someone take a close look to my config below and point to the mistakes i might have put in?

Thanks in advance.

AVM Fritz!Box 7530, OpenWrt 23.05.5
Deutsche Telekom, ONT on LAN1
/etc/config/network:

config interface 'loopback'
	option device 'lo'
	option proto 'static'
	option ipaddr '127.0.0.1'
	option netmask '255.0.0.0'

config globals 'globals'
	option ula_prefix 'fd48:xxxx:yyyy::/48'

config device
	option name 'br-lan'
	option type 'bridge'
	option macaddr 'hidden'
	list ports 'lan2'
	list ports 'lan3'
	list ports 'lan4'

config interface 'lan'
	option device 'br-lan'
	option proto 'static'
	option ip6assign '60'
	list ipaddr '192.168.xxx.yyy/24'

config device
	option name 'lan1'

config device
	option type '8021q'
	option ifname 'lan1'
	option vid '7'
	option name 'WAN'
	option macaddr 'hidden'
	option mtu '1500'
	option txqueuelen '1000'

config interface 'wan'
	option proto 'pppoe'
	option ipv6 'auto'
	option password 'hidden'
	option username 'hidden
        option device 'lan1.7'

config interface 'wan6'
	option device '@wan'
	option proto 'dhcpv6'
2

You will have to use firewall software offload to reach full bandwidth over NAT.

If you have a vacant LAN port just remove it from br-lan, and you can now configure it as another WAN - configure interface like with vlan dhcp pppoe , add interface to firewall WAN zone, add another for ip6

3

Well, that's what i'm trying to accomplish with the config i posted.
And i'd rather not test this with the trial-and-error-method while the rest of the family is complaining that they can't use the internet.

It will take some time (3-6 months, maybe longer) till the fiber connection is avail- and usable at my location.
Hopefully enough time to make some tests late in the evening or early in the morning.

4

You could just change pppoe backend from dsl0.7 to wan.7 (ie lan1.7) when the cable comes in.

5

I had the opportunity to borrow a Telekom Smart router, which can be switched to pure modem.
With this device i could verify that my above posted config works flawlessly.
While at it, i tested the NAT troughput with iperf3, using 2 PCs connected to the router (WAN and LAN).
Without flow offloading there're 590 MBit/s.
With Software flow offloading enabled, i got about 830 MBit/s.
So even with PPPoE, the 7530 should have enough power to drive my future 300 MBit/s fiber without struggling.

1 Like
6

This info can actually be derived from hardware specifications ,-)

7

I haven't found anything meaningful in this regard.
Just "should, might"...
Can you share a link?
At least i know now what my 7530 can do.

I remember reading an article where someone installed additional software on a linux machine so he could connect the router via PPPoE and measure the data throughput under "real operating conditions"...maybe i'll spend some time to look for this article.

8

There was a thread running iperf against loopback which more or less shows soc-s forward speed without offloads. Soft offload roughly doubles it, hard offload if supported bypasses CPU (not in this case)

9

You mean this thread?
Just like @slh stated, it's a quite meaningless test.
When i compare the result of another FB7530

with the 830 MBits/s i got with my test, there's quite a difference.
Whatever, it will work as desired with hopefully enough headroom to play with.

10

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