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Re: dhcpcd failure

Le 2019-02-21 17:07, Roy Marples a écrit :

On 21/02/2019 14:58, triaxx wrote:

Le 2019-01-18 17:54, Andy Ruhl a écrit :

On Fri, Jan 18, 2019 at 2:09 AM Roy Marples <roy%marples.name@localhost> wrote:


Hi Fred

On 18/01/2019 06:05, triaxx wrote:
> I experienced a dhcpcd that cannot connect to a Cisco gateway through a
> fresh NetBSD 8.0. I tried dhclient which succeed.
>
> I didn't see relevant diff between MAIN and netbsd-8.
>
> I would like to send a PR but I'm interesting to know what informations
> could be relevant/helping.
You could try editing /etc/dhcpcd.conf and commenting out duid and using 
clientid. If that still fails, try commenting out both.
If either work, complain to Cisco about their lack of RFC compliance. 
Regardless, let me know the outcome please.


If it really is a Cisco compliance issue, I'd like to see a wireshark
of the failing request and the successful one for my own amusement.
This command seems to work on my mac, I'm guessing it will be similar
on NetBSD except the interface name:

tshark -i en0 -f "udp port 67 or 68" -w dhcp.pcap

Andy
tcpdump is like the observer of the Schrödinger's cat, it interfere in measurement.
If I run tcpdump -i re0 "udp port 67 or 68" -w dhcpcd.pcap when running service -v dhcpcd restart, it works fine... 

Then, I can just provide the packet trace when the request succeed:
14:56:43.981194 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from 80:ee:73:c1:cd:36 (oui Unknown), length 318 14:56:44.019208 IP 192.168.0.1.bootps > 192.168.0.11.bootpc: BOOTP/DHCP, Reply, length 548 14:56:44.019338 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from 80:ee:73:c1:cd:36 (oui Unknown), length 325 14:56:44.079055 IP 192.168.0.1.bootps > 192.168.0.11.bootpc: BOOTP/DHCP, Reply, length 548 14:56:53.955162 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from 80:ee:73:c1:cd:36 (oui Unknown), length 319 14:56:53.988890 IP 192.168.0.1.bootps > 192.168.0.11.bootpc: BOOTP/DHCP, Reply, length 548 

Looks to me like the DHCP client is broadcasting for a lease (ie it
doesn't have an IP address) but the DHCP server thinks it has an IP
address and is unicasting to something that doesn't exist?

Can you add more -vvvv to see if the client is giving any hints if it
has an ip address?

Roy


I hope -vv is sufficient...

When it failed (with tcpdump in non promiscuous mode):
<cisco_syslog>
1 2019/01/16 5:48:05 PM info udhcpd[1154]: sending OFFER to 255.255.255.255 with 192.168.0.11 2 2019/01/16 5:48:05 PM info udhcpd[1154]: received DISCOVER from 80:EE:73:C1:CD:36 3 2019/01/16 5:47:57 PM info udhcpd[1154]: sending OFFER to 255.255.255.255 with 192.168.0.11 4 2019/01/16 5:47:57 PM info udhcpd[1154]: received DISCOVER from 80:EE:73:C1:CD:36 
</cisco_syslog>

<host_tcpdump>
16:06:03.322149 IP (tos 0x0, ttl 64, id 39057, offset 0, flags [none], proto UDP (17), length 343) 0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request from 80:ee:73:c1:cd:36 (oui Unknown), length 315, xid 0x7e4dd14c, Flags [none] (0x0000) 
	  Client-Ethernet-Address 80:ee:73:c1:cd:36 (oui Unknown)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Discover
	    NOAUTO Option 116, length 1: Y
	    MSZ Option 57, length 2: 1472
Vendor-Class Option 60, length 36: "dhcpcd-7.0.6:NetBSD-8.0:amd64:x86_64" 
	    Hostname Option 12, length 6: "zealot"
	    T145 Option 145, length 1: 1
	    Parameter-Request Option 55, length 13:
Subnet-Mask, Classless-Static-Route, Static-Route, Default-Gateway 
	      Domain-Name-Server, Hostname, Domain-Name, MTU
	      BR, Lease-Time, RN, RB
	      Option 119
16:06:07.213394 IP (tos 0x0, ttl 64, id 14364, offset 0, flags [none], proto UDP (17), length 343) 0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request from 80:ee:73:c1:cd:36 (oui Unknown), length 315, xid 0x7e4dd14c, secs 3, Flags [none] (0x0000) 
	  Client-Ethernet-Address 80:ee:73:c1:cd:36 (oui Unknown)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Discover
	    NOAUTO Option 116, length 1: Y
	    MSZ Option 57, length 2: 1472
Vendor-Class Option 60, length 36: "dhcpcd-7.0.6:NetBSD-8.0:amd64:x86_64" 
	    Hostname Option 12, length 6: "zealot"
	    T145 Option 145, length 1: 1
	    Parameter-Request Option 55, length 13:
Subnet-Mask, Classless-Static-Route, Static-Route, Default-Gateway 
	      Domain-Name-Server, Hostname, Domain-Name, MTU
	      BR, Lease-Time, RN, RB
	      Option 119
</host_tcpdump>

When it succeed (with tcpdump in promiscuous mode):
<cisco_syslog>
1 2019/01/16 5:55:46 PM info udhcpd[1154]: sending ACK to 255.255.255.255 2 2019/01/16 5:55:46 PM info udhcpd[1154]: received REQUEST from 80:EE:73:C1:CD:36 3 2019/01/16 5:55:46 PM info udhcpd[1154]: sending OFFER to 255.255.255.255 with 192.168.0.11 4 2019/01/16 5:55:46 PM info udhcpd[1154]: received DISCOVER from 80:EE:73:C1:CD:36 
</cisco_syslog>

<host_tcpdump>
16:13:56.433576 IP (tos 0x0, ttl 64, id 14917, offset 0, flags [none], proto UDP (17), length 343) 0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request from 80:ee:73:c1:cd:36 (oui Unknown), length 315, xid 0x66ec8de4, Flags [none] (0x0000) 
	  Client-Ethernet-Address 80:ee:73:c1:cd:36 (oui Unknown)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Discover
	    NOAUTO Option 116, length 1: Y
	    MSZ Option 57, length 2: 1472
Vendor-Class Option 60, length 36: "dhcpcd-7.0.6:NetBSD-8.0:amd64:x86_64" 
	    Hostname Option 12, length 6: "zealot"
	    T145 Option 145, length 1: 1
	    Parameter-Request Option 55, length 13:
Subnet-Mask, Classless-Static-Route, Static-Route, Default-Gateway 
	      Domain-Name-Server, Hostname, Domain-Name, MTU
	      BR, Lease-Time, RN, RB
	      Option 119
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"
16:13:56.468254 IP (tos 0x0, ttl 64, id 5823, offset 0, flags [none], proto UDP (17), length 352) 0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request from 80:ee:73:c1:cd:36 (oui Unknown), length 324, xid 0x66ec8de4, Flags [none] (0x0000) 
	  Client-Ethernet-Address 80:ee:73:c1:cd:36 (oui Unknown)
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Request
	    Requested-IP Option 50, length 4: 192.168.0.11
	    Server-ID Option 54, length 4: 192.168.0.1
	    MSZ Option 57, length 2: 1472
Vendor-Class Option 60, length 36: "dhcpcd-7.0.6:NetBSD-8.0:amd64:x86_64" 
	    Hostname Option 12, length 6: "zealot"
	    T145 Option 145, length 1: 1
	    Parameter-Request Option 55, length 13:
Subnet-Mask, Classless-Static-Route, Static-Route, Default-Gateway 
	      Domain-Name-Server, Hostname, Domain-Name, MTU
	      BR, Lease-Time, RN, RB
	      Option 119
16:13:56.537782 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: ACK
	    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"
</host_tcpdump>
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