Loss of Default Gateway

May 10, 2019 6 Replies
A

I've just changed my router, but the new one has been setup with the same IP address (192.168.1.254).



I've also got 6 PIs on my network. Of those, 2 seem OK, but the other four have decided that their default gateway is now going to be



192.168.1.1.

I've used route delete default gw 192.168.1.1 eth0 route add default gw 192.168.1.254 eth0



to reset the default gateway, but in each case, overnight the default has reset itself back to 192.168.1.1 None of the PIs have been rebooted. I'm not convinced that this is a coincidence, but my WIN7 PC also reset the default gateway mid evening (whilst I was using it), again to 192.168.1.1.



Any suggestions on how I can persuade my PIs to stick to the proper GW ?



Thanks



Adrian


To Reply : replace "bulleid" with "adrian" - all mail to bulleid is rejected Sorry for the rigmarole, If I want spam, I'll go to the shops Every time someone says "I don't believe in trolls", another one dies.
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T

Have a feeling default routes are set elsewhere these days

Lemme see in Mi Pi...

Ah yes. Imn /etc/dhcpcd.conf

there will be a line saying

static routers=192.168.1.254 or whatever.

Make sure it is.

Pis tend to use dhcp and te easy way to static them is to frig with dhcp

- but these Pis might hacve decided to 'renew their leases'

And also make sure that the router* isnt advertising a bad gateway

*or some other dhcp master on the LAN
Labour - a bunch of rich people convincing poor people to vote for rich people by telling poor people that "other" rich people are the reason they are poor. Peter Thompson
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A

Thanks.

This is rather odd. The two PIs that are behaving don't have a /etc/dhcpcd.conf file at all. The other four have one, but the relevant entries were commented out.

It will be interesting to see if things behave now.

Adrian

To Reply : replace "bulleid" with "adrian" - all mail to bulleid is rejected Sorry for the rigmarole, If I want spam, I'll go to the shops Every time someone says "I don't believe in trolls", another one dies.
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T

That is consistent with a full DHCP non static address.

Is your new router advertising the wrong gateway?

Canada is all right really, though not for the whole weekend. "Saki"
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D

ther

The router is probably still advertising 192.168.1.1 as the default gateway via DHCP. Make sure it doesn't have a separate setting for the default gateway, as some will allow it to be different from their own address. Then reboot the router, and any Pis with the wrong gateway (or use dhclient to get a new lease).

---druck

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A

A bit more digging in the router, and indeed, it is possible to have a gateway IP address that is different to the router IP address. I've changed the gateway IP address from 1.1 to 1.254 and rebooted. Time will tell what that does. A quick test with my phone suggests that it is working.

Thanks

Adrian

To Reply : replace "bulleid" with "adrian" - all mail to bulleid is rejected Sorry for the rigmarole, If I want spam, I'll go to the shops Every time someone says "I don't believe in trolls", another one dies.
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T

That is sound practice anyway. So that 'dhcp only' clients will work

You can get much farther with a kind word and a gun than you can with a kind word alone. Al Capone
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