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At wits end - DHCP issues with Virgin Media

podgerodge
Tuning in

Long story short, have a new router and rebooted it (trying to fix a separate problem) and lost internet access. It's now disconnected and wifi re-enabled on Virgin Media box (in router mode which was working fine with wifi disabled).

Now, I have access on some devices. But not on others. Example - an internet radio keeps giving "network timeout" and dhcp errors. So I went into Hub 2.0 and looked at DHCP lease time (not that I have a clue) and it was 24 hours (86400). I changed that to 2 minutes (120) and the internet radio immediately came on. Switched it back to 86400 and timeout again immediately.

 

I haven't a clue what is going on, but I suspect that DHCP issues from the Virgin Hub are probably causing the fact that my router and radios etc. are all very confused.

Any suggestions? Can a 2 minute DHCP lease cause other issues, and if I revert to 24 hours, and turn the modem off, will everything unlease itself and go back to normal. Thanks!

1 ACCEPTED SOLUTION

Accepted Solutions

Client62
Legend

OK I am now confused.

In the original post the Hub 2 DHCP lease period is mentioned - hence assume Hub 2 is in Router mode.

But in the most recent post a Asus AX52 Router is mentioned - configuration not known.

I would expect the configuration to be Hub 2 in modem mode + Asus AX52 in router mode performing DHCP.

What the post suggests is the Hub 2 is Router mode with DHCP enabled + Asus AX52 but how is this configured ?

Are there two active DHCP severs on the LAN each issuing IPs on a different subnets leading to devices working or not in a hit and miss basis.

See where this Helpful Answer was posted

10 REPLIES 10

legacy1
Alessandro Volta

put hub in modem mode get your own router with 1Gb ports

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Client62
Legend

Use whatever DHCP lease time gets the Hub 2 to work until you can request a replacement VM Hub.

podgerodge
Tuning in

Thanks both.

The router is a brand new Asus AX52 and the hub was delivered last week new to replace an old one. 

All worked fine until I started messing yesterday!

I'll try modem mode. 

Client62
Legend

OK I am now confused.

In the original post the Hub 2 DHCP lease period is mentioned - hence assume Hub 2 is in Router mode.

But in the most recent post a Asus AX52 Router is mentioned - configuration not known.

I would expect the configuration to be Hub 2 in modem mode + Asus AX52 in router mode performing DHCP.

What the post suggests is the Hub 2 is Router mode with DHCP enabled + Asus AX52 but how is this configured ?

Are there two active DHCP severs on the LAN each issuing IPs on a different subnets leading to devices working or not in a hit and miss basis.

Router is an Asus AX52 purchased last week.

Originally, when I set it up, the Virgin Media Hub was in Router Mode, but I disabled the 2.4 and 5ghz wifi. The Virgin Hub was accessible (and still is) on 192.168.0.1 . The setup page for the Hub (which currently has the 2 minute DHCP lease due to my change) shows "starting local address" of 192.168.0.10. I have never used Modem mode to date.

I then initially had the AX52 in Router Mode and as far as I recall, the ip address assigned was 192.168.50.1, before changing it to AP mode (for some reason that I don't recall) and it all worked fine either way.

I think I messed up the Asus app at some point when I was trying to figure out why a mobile phone wouldn't connect to the wifi (it turned out that it was because it was Wifi6 that the phone couldn't connect to), and at that stage the damage was done as all the problems began.

The router is completely removed from the equation now as I try to figure things out. But the internet timeout persists, albeit I think it's only on 1 device now, the internet radio.

Perhaps there is some double dhcp thing going on? 

As i said to someone else, I'm the person they wrote "a little knowledge is a dangerous thing" about. 

podgerodge
Tuning in

Separately, in my initial setup, I was wired from my VM Hub to the WAN port of the Asus - if all I'm trying to achieve is a better wifi signal, am I better off wiring from VM Hub to a LAN port of the Asus - would that keep everything on the same network, no "double nats" or whatever, and allow me to broadcast Wifi from the Asus (having disabled wifi on the Hub)?  Apologies if I am talking nonsense!

podgerodge
Tuning in

@Client62

IGNORE previous posts.  I seem to have solved things.  Including someone on an Irish bulletin board suggesting I assign the Asus MAC address to a dedicated 192.168.0.250 on the VM modem.

As I actually had port forwarding for CCTV on my Hub, and ALSO 2 ethernet cables from the VM Hub running over my roof to provide wired access in 2 rooms, I didn't want to go into Modem Mode - as my understanding is that this would stop those LAN ports working.

So…I assigned the Asus MAC address which I found on the back of the Asus, to 192.168.0.250. That's handy - as I can know that this is always going to be the login page for the Asus on my pc.

I then disabled WIFI on the VM Hub, re-setup the Asus which automatically went into Router Mode, but then changed that to AP mode and bingo, all looks ok.

I'm not sure if I'm technically in this "double nat" thing but seems grand.

Things are far from grand the way you've set that up. If you are going to use an another router (as a router!) but the hub in modem mode.

But I put the Asus in AP mode so it's not being used as a router?  Is that not sufficient?