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9 posts

Wannabe Geek
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Topic # 238176 5-Jul-2018 17:50
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I had wondered for a while that on Vodafone FibreX whether it's possible to have multiple addresses assigned over DHCP;

The modem supplied by vodafone contains two ethernet ports; it is possible to connect two routers to the modem and have two different addresses assigned. This normally requires a reboot of the modem.
The routers will have layer 2 reachability as the modem acts as a switch but may be assigned addresses in different subnets

Connecting the single modem to multiple routers is very handy in a shared flat because you can share an internet connection without having the security risk of sharing a LAN with your roomates.

The next experiment I tried was with my Ubiquiti EdgeRouter X, it had a switch0.10 interface assigning the router an IP. I then passed Vlan10 to one of the switch ports which connected to my Unifi AP. I was able to distribute my WAN over WiFi!
I think i tried maybe 3 or 4 addresses simultaneously, and it seemed to work. This was only an experiment and not a long term thing.

So far, for the past few weeks, I've been making use of the multi-gigabit port on the modem; one port is the huawei cpe for my family, the other is my own equipment and it seems to be working quite well.

Hope this was interesting/useful

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'That VDSL Cat'
9222 posts

Uber Geek
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  Reply # 2050043 5-Jul-2018 19:14
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This was a bit of a known thing back in that day.. was abused a fair bit for Vodafone TV by folk who didn't want to configure their third party modem correctly for IGMP to go through.


They turned quiet very quick after mentioning it here, no idea why... ;)




While it's pretty useful for a quick troubleshooting, i'd advise never to use it in production. (such as what your doing).


i'd fully expect to see vodafone folk around here very quickly come say, do not do that.

#include <std_disclaimer>


Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.

141 posts

Master Geek
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Vodafone NZ

  Reply # 2050050 5-Jul-2018 19:23
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Yeah, it should work fine on any access where you're using DHCP. We see a handful of people connecting 2 or more times, most of them unintentionally. Just bear in mind that it's more of a quirk than a product feature, so potentially it'll stop working that way one day.


14239 posts

Uber Geek
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  Reply # 2050056 5-Jul-2018 19:35
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Its CopperX BTW. No glass was harmed in creating your connection.

9 posts

Wannabe Geek
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  Reply # 2050107 5-Jul-2018 20:36
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I know that their 'FibreX' is actually HFC (Copper coax in the last mile).

Do we actually call it 'CopperX' here?

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