sudo tcpdump -S -i eth2 -nvvvv port 67 or port 68
tcpdump: WARNING: eth2: no IPv4 address assigned
tcpdump: listening on eth2, link-type EN10MB (Ethernet), capture size 65535 bytes
18:07:47.603413 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 74:2f:68:2d:68:f1, length 300, xid 0x3c12bb22, Flags [none] (0x0000)
Client-Ethernet-Address 74:2f:68:2d:68:f1
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 11: "mikhail-upc"
Parameter-Request Option 55, length 17:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Option 119, Hostname
Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
NTP, Classless-Static-Route, Classless-Static-Route-Microsoft, Option 252
NTP
Client-ID Option 61, length 6: hardware-type 116, 2f:68:2d:68:f1
END Option 255, length 0
PAD Option 0, length 0, occurs 16
18:07:50.802965 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 74:2f:68:2d:68:f1, length 300, xid 0x3c12bb22, secs 3, Flags [none] (0x0000)
Client-Ethernet-Address 74:2f:68:2d:68:f1
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 11: "mikhail-upc"
Parameter-Request Option 55, length 17:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Option 119, Hostname
Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
NTP, Classless-Static-Route, Classless-Static-Route-Microsoft, Option 252
NTP
Client-ID Option 61, length 6: hardware-type 116, 2f:68:2d:68:f1
END Option 255, length 0
PAD Option 0, length 0, occurs 16
18:07:55.151009 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 74:2f:68:2d:68:f1, length 300, xid 0x3c12bb22, secs 8, Flags [none] (0x0000)
Client-Ethernet-Address 74:2f:68:2d:68:f1
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 11: "mikhail-upc"
Parameter-Request Option 55, length 17:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Option 119, Hostname
Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
NTP, Classless-Static-Route, Classless-Static-Route-Microsoft, Option 252
NTP
Client-ID Option 61, length 6: hardware-type 116, 2f:68:2d:68:f1
END Option 255, length 0
PAD Option 0, length 0, occurs 16
18:08:04.175118 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 74:2f:68:2d:68:f1, length 300, xid 0x3c12bb22, secs 17, Flags [none] (0x0000)
Client-Ethernet-Address 74:2f:68:2d:68:f1
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 11: "mikhail-upc"
Parameter-Request Option 55, length 17:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Option 119, Hostname
Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
NTP, Classless-Static-Route, Classless-Static-Route-Microsoft, Option 252
NTP
Client-ID Option 61, length 6: hardware-type 116, 2f:68:2d:68:f1
END Option 255, length 0
PAD Option 0, length 0, occurs 16
18:08:18.555003 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 74:2f:68:2d:68:f1, length 300, xid 0x3c12bb22, secs 31, Flags [none] (0x0000)
Client-Ethernet-Address 74:2f:68:2d:68:f1
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 11: "mikhail-upc"
Parameter-Request Option 55, length 17:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Option 119, Hostname
Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
NTP, Classless-Static-Route, Classless-Static-Route-Microsoft, Option 252
NTP
Client-ID Option 61, length 6: hardware-type 116, 2f:68:2d:68:f1
END Option 255, length 0
PAD Option 0, length 0, occurs 16
18:08:32.915526 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 74:2f:68:2d:68:f1, length 300, xid 0x3c12bb22, secs 45, Flags [none] (0x0000)
Client-Ethernet-Address 74:2f:68:2d:68:f1
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 11: "mikhail-upc"
Parameter-Request Option 55, length 17:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Option 119, Hostname
Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
NTP, Classless-Static-Route, Classless-Static-Route-Microsoft, Option 252
NTP
Client-ID Option 61, length 6: hardware-type 116, 2f:68:2d:68:f1
END Option 255, length 0
PAD Option 0, length 0, occurs 16
18:08:38.754454 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 74:2f:68:2d:68:f1, length 300, xid 0x462ec74e, Flags [none] (0x0000)
Client-Ethernet-Address 74:2f:68:2d:68:f1
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 11: "mikhail-upc"
Parameter-Request Option 55, length 17:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Option 119, Hostname
Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
NTP, Classless-Static-Route, Classless-Static-Route-Microsoft, Option 252
NTP
Client-ID Option 61, length 6: hardware-type 116, 2f:68:2d:68:f1
END Option 255, length 0
PAD Option 0, length 0, occurs 16
18:08:41.314924 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 74:2f:68:2d:68:f1, length 300, xid 0x462ec74e, secs 3, Flags [none] (0x0000)
Client-Ethernet-Address 74:2f:68:2d:68:f1
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 11: "mikhail-upc"
Parameter-Request Option 55, length 17:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Option 119, Hostname
Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
NTP, Classless-Static-Route, Classless-Static-Route-Microsoft, Option 252
NTP
Client-ID Option 61, length 6: hardware-type 116, 2f:68:2d:68:f1
END Option 255, length 0
PAD Option 0, length 0, occurs 16
18:08:45.070949 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 74:2f:68:2d:68:f1, length 300, xid 0x462ec74e, secs 7, Flags [none] (0x0000)
Client-Ethernet-Address 74:2f:68:2d:68:f1
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 11: "mikhail-upc"
Parameter-Request Option 55, length 17:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Option 119, Hostname
Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
NTP, Classless-Static-Route, Classless-Static-Route-Microsoft, Option 252
NTP
Client-ID Option 61, length 6: hardware-type 116, 2f:68:2d:68:f1
END Option 255, length 0
PAD Option 0, length 0, occurs 16
18:08:52.994854 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 74:2f:68:2d:68:f1, length 300, xid 0x462ec74e, secs 14, Flags [none] (0x0000)
Client-Ethernet-Address 74:2f:68:2d:68:f1
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 11: "mikhail-upc"
Parameter-Request Option 55, length 17:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Option 119, Hostname
Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
NTP, Classless-Static-Route, Classless-Static-Route-Microsoft, Option 252
NTP
Client-ID Option 61, length 6: hardware-type 116, 2f:68:2d:68:f1
END Option 255, length 0
PAD Option 0, length 0, occurs 16
18:09:07.415711 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 74:2f:68:2d:68:f1, length 300, xid 0x462ec74e, secs 29, Flags [none] (0x0000)
Client-Ethernet-Address 74:2f:68:2d:68:f1
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 11: "mikhail-upc"
Parameter-Request Option 55, length 17:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Option 119, Hostname
Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
NTP, Classless-Static-Route, Classless-Static-Route-Microsoft, Option 252
NTP
Client-ID Option 61, length 6: hardware-type 116, 2f:68:2d:68:f1
END Option 255, length 0
PAD Option 0, length 0, occurs 16
18:09:18.334951 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 74:2f:68:2d:68:f1, length 300, xid 0x462ec74e, secs 40, Flags [none] (0x0000)
Client-Ethernet-Address 74:2f:68:2d:68:f1
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 11: "mikhail-upc"
Parameter-Request Option 55, length 17:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Option 119, Hostname
Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
NTP, Classless-Static-Route, Classless-Static-Route-Microsoft, Option 252
NTP
Client-ID Option 61, length 6: hardware-type 116, 2f:68:2d:68:f1
END Option 255, length 0
PAD Option 0, length 0, occurs 16
18:09:27.767322 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from 74:2f:68:2d:68:f1, length 300, xid 0x17b0192a, Flags [none] (0x0000)
Client-Ethernet-Address 74:2f:68:2d:68:f1
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 11: "mikhail-upc"
Parameter-Request Option 55, length 17:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Option 119, Hostname
Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
NTP, Classless-Static-Route, Classless-Static-Route-Microsoft, Option 252
NTP
Client-ID Option 61, length 6: hardware-type 116, 2f:68:2d:68:f1
END Option 255, length 0
PAD Option 0, length 0, occurs 16