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
