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Bridging LAN Ports in XPEnology to Add Switch Functionality


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I came across this thread when looking into the subject of trying to get LAN ports to act as a switch in XPEnology / DSM:


https://forum.synology.com/enu/viewtopi ... tl#p293971


If you don't want to translate and go through all the posts, here's quick how to:


1) enable ssh in control panel -> terminal

2) login via putty - ssh: root : user_admin_password_should_work :smile:

3) > su

4) change the IPs for your network before (omit Synology#):

Synology# insmod /lib/modules/stp.ko

Synology# insmod /lib/modules/bridge.ko

Synology# brctl addbr br0

Synology# brctl stp br0 off

Synology# ifconfig br0 netmask up

Synology# brctl addif br0 eth0

Synology# brctl addif br0 eth1

Synology# ifconfig eth0 promisc up

Synology# ifconfig eth1 promisc up

Synology# route add default gw dev br0


5) check with Synology# brctl show

6) if everything works you want to create a script which makes this work after the restart

7) vi /usr/syno/etc.defaults/rc.d/create-bridge.sh

8) insert previous commands (of course without Synology#) and save

9) chmod 755 /usr/syno/etc.defaults/rc.d/create-bridge.sh

10) restart and test


Good luck.



To which I would add:


Instead of using typical Ethernet ports one could add a few low cost Dual Port SFP+ 10GbE NIC cards to act as a cheap 10GbE switch. Then expand the process to more then just bridging two ports.


Anyone have thoughts on this?



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Even if you do packet forwarding the fast path, without involving all the TCP/IP stack built into the linux kernel, all the forwarding sill needs to be handled by your processor. Try some 1G links and see how much you can saturate them. I highly doubt that you'll gain benefits from 10GE interfaces, because your CPU probably won't be able to forward that much traffic.

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I'm not in the position to try this yet but it has been pointed out to me (before posting this thread) that a Quanta LB6M 10GB 24-Port SFP+ Switch (with or without Dual Power Supply) can come in on e-bay for less then ~$250 USD. That is an incredibly cost effective and robust solution IMO. So that would be my go to option as soon as I am ready to cough up the ~$250 and risk a venture on e-bay. In the interim this or a VyOS solution with a similar purpose / configuration remains a possible option.


Even if full 10GbE speeds are not attainable it's still a boon if one can go beyond 1GB speeds.


For the here and now though I would only realistically need 10GbE speeds for my server and NAS. So a DAC link between the two and a single port SFP+ NIC on each is all that is really needed.

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