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I've configured wlan0 on my Pi, (file /etc/network/interfaces and /etc/wpa_supplicant.conf). In the past I could connect to it with no problems but now I can't. I've tried a few different LANs and I can't get any to work.

Every time I do either ifdown or ifup I get the result:

Internet Systems Consortium DHCP Client 4.3.1
Copyright 2004-2014 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Can't allocate interface wllease {
  interface .

Any hints?

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I had the same question，you can try remove /var/lib/dhcp/* , I hope it work.

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    /var/lib/dhcp/.. contains leases used by dhclient. By default Raspbian doesn't use this, it uses dhcpcd, whose leases are in /var/lib/dhcpcd/*.leases. I have noticed in the past removing them sometimes does solve this problem, though, at least with dhclient (I've never tried with dhcpcd). I don't think removing entire directories is a great idea though (you suggestion implies this), just the leases, which are pretty obvious.
    – goldilocks ♦
    Commented Nov 7, 2019 at 13:07
  • Raspbian is allocated IP through DHCP as client，so I think it should use /var/lib/dhcp/.. - leases file.Of course just remove the leases should be right,I suggest the whole directory for simplification
    – cloud Jiang
    Commented Nov 20, 2019 at 3:50
  • DHCP is a protocol. dhcpcd and dhclient are implementations of the client side of that protocol. They both do the same thing, but they are separate and distinct applications that have different configuration and runtime directories. As I already said, if you remove the leases left by dhcpcd at some point but are using dhclient, it will not matter because it does not use those, it uses the ones in its own runtime directory. And vice versa.
    – goldilocks ♦
    Commented Nov 20, 2019 at 14:13
  • give you a thumb-up.
    – cloud Jiang
    Commented Jan 15, 2020 at 2:36

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