Re: dhcpcd failure

[triaxx <triaxx%triaxx.org@localhost>]

Le 2019-02-21 17:30, Roy Marples a écrit :
> On 21/02/2019 16:18, triaxx wrote:
> > <cisco_syslog>
> > 3    2019/01/16 5:55:46 PM    info    udhcpd[1154]: sending OFFER to 
> > 255.255.255.255 with 192.168.0.11
> >
> > <host_tcpdump>
> > 16:13:56.468169 IP (tos 0x0, ttl 64, id 0, offset 0, flags [none], 
> > proto UDP (17), length 576)
> >      192.168.0.1.bootps > 192.168.0.11.bootpc: [udp sum ok] 
> > BOOTP/DHCP, Reply, length 548, xid 0x66ec8de4, Flags [none] (0x0000)
> >        Your-IP 192.168.0.11
> >        Server-IP 192.168.0.1
> >        Client-Ethernet-Address 80:ee:73:c1:cd:36 (oui Unknown)
> >        Vendor-rfc1048 Extensions
> >          Magic Cookie 0x63825363
> >          DHCP-Message Option 53, length 1: Offer
> >          Server-ID Option 54, length 4: 192.168.0.1
> >          Lease-Time Option 51, length 4: 86400
> >          Subnet-Mask Option 1, length 4: 255.255.255.0
> >          Default-Gateway Option 3, length 4: 192.168.0.1
> >          Domain-Name-Server Option 6, length 4: 192.168.0.1
> >          Domain-Name Option 15, length 11: "atlas.local"
>
> What cisco says it's doing and what it's actually doing are different.
> It's claiming sending offer of 192.168.0.11 to 255.255.255.255 (which
> is correct) but in reality it's unicasting to 192.168.0.11.
>
> I don't see how any DHCP client can work with that.
> You might try getting dhcpcd to send the broadcast option using the -J
> flag. That's non standard though and I doubt it will fix the issue.
>
> Roy

As least cisco respects -J but it doesn't fix the problem.

16:40:06.514754 IP (tos 0x0, ttl 64, id 0, offset 0, flags [none], proto 
UDP (17), length 576)
    192.168.0.1.bootps > 255.255.255.255.bootpc: [udp sum ok] 
BOOTP/DHCP, Reply, length 548, xid 0xe090f980, Flags [Broadcast] 
(0x8000)
	  Your-IP 192.168.0.11
	  Server-IP 192.168.0.1
	  Client-Ethernet-Address 80:ee:73:c1:cd:36 (oui Unknown)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Offer
	    Server-ID Option 54, length 4: 192.168.0.1
	    Lease-Time Option 51, length 4: 86400
	    Subnet-Mask Option 1, length 4: 255.255.255.0
	    Default-Gateway Option 3, length 4: 192.168.0.1
	    Domain-Name-Server Option 6, length 4: 192.168.0.1
	    Domain-Name Option 15, length 11: "atlas.local"
	    END Option 255, length 0
	    PAD Option 0, length 0, occurs 261