Attachment 115829 Details for Bug 90478 – tcpdump, resolv.conf and leases output

tcpdump, resolv.conf and leases output

resolved_order.txt (text/plain), 3.02 KB, created by nrocco on 2015-05-16 11:47:48 UTC

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Creator: nrocco

Created: 2015-05-16 11:47:48 UTC

Size: 3.02 KB

patch

obsolete

>Order: 212.54.44.54, 192.168.178.70
>-----------------------------------
>
>dhcp reply with tcpdump
>
>    $ sudo tcpdump -i wlp2s0 -vvvnn -s 1500 '(port 67 or port 68)'
>    12:58:14.848055 IP (tos 0x0, ttl 128, id 57005, offset 0, flags [none], proto UDP (17), length 328)
>        192.168.178.1.67 > 192.168.178.16.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0xa4e62230, Flags [none] (0x0000)
>          Your-IP 192.168.178.16
>          Server-IP 192.168.178.1
>          Client-Ethernet-Address xx:xx:xx:xx:xx:xx
>          Vendor-rfc1048 Extensions
>            Magic Cookie 0x63825363
>            DHCP-Message Option 53, length 1: ACK
>            Subnet-Mask Option 1, length 4: 255.255.255.0
>            Time-Zone Option 2, length 4: 0
>            Default-Gateway Option 3, length 4: 192.168.178.1
>            TTL Option 23, length 1: 64
>            Lease-Time Option 51, length 4: 86400
>            Server-ID Option 54, length 4: 192.168.178.1
>            Domain-Name-Server Option 6, length 8: 212.54.44.54,192.168.178.70
>            END Option 255, length 0
>            PAD Option 0, length 0, occurs 13
>
>
>Order: 192.168.178.70, 212.54.44.54
>-----------------------------------
>
>dhcp reply with tcpdump:
>
>    $ sudo tcpdump -i wlp2s0 -vvvnn -s 1500 '(port 67 or port 68)'
>    13:11:09.619238 IP (tos 0x0, ttl 128, id 57005, offset 0, flags [none], proto UDP (17), length 328)
>        192.168.178.1.67 > 192.168.178.16.68: [udp sum ok] BOOTP/DHCP, Reply, length 300, xid 0x3add588f, Flags [none] (0x0000)
>          Your-IP 192.168.178.16
>          Server-IP 192.168.178.1
>          Client-Ethernet-Address xx:xx:xx:xx:xx:xx
>          Vendor-rfc1048 Extensions
>            Magic Cookie 0x63825363
>            DHCP-Message Option 53, length 1: ACK
>            Subnet-Mask Option 1, length 4: 255.255.255.0
>            Time-Zone Option 2, length 4: 0
>            Default-Gateway Option 3, length 4: 192.168.178.1
>            TTL Option 23, length 1: 64
>            Lease-Time Option 51, length 4: 86400
>            Server-ID Option 54, length 4: 192.168.178.1
>            Domain-Name-Server Option 6, length 8: 192.168.178.70,212.54.44.54
>            END Option 255, length 0
>            PAD Option 0, length 0, occurs 13
>
>
>But 212.54.44.54 is always on top
>---------------------------------
>
>resolv.conf file after dhcp lease acquired:
>
>    $ cat /etc/resolv.conf
>    # This file is managed by systemd-resolved(8). Do not edit.
>    #
>    # Third party programs must not access this file directly, but
>    # only through the symlink at /etc/resolv.conf. To manage
>    # resolv.conf(5) in a different way, replace the symlink by a
>    # static file or a different symlink.
>
>    nameserver 212.54.44.54
>    nameserver 192.168.178.70
>
>
>Lease information as stored by systemd
>
>    $ cat /run/systemd/netif/leases/2
>    # This is private data. Do not parse.
>    ADDRESS=192.168.178.16
>    NETMASK=255.255.255.0
>    ROUTER=192.168.178.1
>    SERVER_ADDRESS=192.168.178.1
>    NEXT_SERVER=192.168.178.1
>    DNS=192.168.178.70 212.54.44.54
>    NTP=
>    CLIENTID=ffe708d2ba00020000ab11f816004b73b60272

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