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ru.unix
- RU.UNIX ----------------------------------------------------------------------
From : Eugene B. Berdnikov 2:5020/400 10 Aug 2007 00:08:19
To : Alexander Titaev
Subject : Re: grab dhcp traffic
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Alexander Titaev <Alexander.Titaev@f66.n5070.z2.fidonet.org> wrote:
AT> уже попробовал, правда в виде
AT> tcpdump -X -s 1500 -n -i re0 port 67 or port 68
AT> за сутки больно куций результат, и тех опций что отдаются я там не вижу.
AT> Или его в виде текста и не увидишь, тк оно сплошь бинарное?
# tcpdump -nlpvv -s0 -i int port 67 or port 68
tcpdump: listening on int, link-type EN10MB (Ethernet), capture size 65535 bytes
22:28:48.096298 IP (tos 0x0, ttl 128, id 31796, offset 0, flags [none], proto:
UDP (17), length: 344) 172.31.29.142.68 > 172.31.16.47.67: [udp sum ok]
BOOTP/DHCP, Request from 00:0c:29:1d:bc:e9, length 316, xid 0x939e3ba4, Flags [
none ] (0x0000)
Client-IP 172.31.29.142
Client-Ethernet-Address 00:0c:29:1d:bc:e9
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Request
Client-ID Option 61, length 7: ether 00:0c:29:1d:bc:e9
Hostname Option 12, length 10: "vm-monstr1"
FQDN Option 81, length 26: "vm-monstr1.dhcp1.cbr.ru"
Vendor-Class Option 60, length 8: "MSFT 5.0"
Parameter-Request Option 55, length 11:
Subnet-Mask, Domain-Name, Default-Gateway, Domain-Name-Server
Netbios-Name-Server, Netbios-Node, Netbios-Scope, Router-Discovery
Static-Route, Option 249, Vendor-Option
22:28:48.330749 IP (tos 0x0, ttl 64, id 3528, offset 0, flags [DF], proto: UDP
(17), length: 353) 172.31.16.47.67 > 172.31.29.142.68: [udp sum ok] BOOTP/DHCP,
Reply, length 325, xid 0x939e3ba4, Flags [ none ] (0x0000)
Client-IP 172.31.29.142
Your-IP 172.31.29.142
Client-Ethernet-Address 00:0c:29:1d:bc:e9
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: ACK
Server-ID Option 54, length 4: 172.31.16.47
Lease-Time Option 51, length 4: 43200
FQDN Option 81, length 26: "vm-monstr1.dhcp1.cbr.ru"
Subnet-Mask Option 1, length 4: 255.255.240.0
Domain-Name Option 15, length 12: "dhcp1.cbr.ru"
Default-Gateway Option 3, length 4: 172.31.16.1
Domain-Name-Server Option 6, length 4: 172.31.16.254
Netbios-Name-Server Option 44, length 4: 172.31.16.254
Netbios-Node Option 46, length 1: h-node
Примерно так... ;)
--
Eugene Berdnikov
--- ifmail v.2.15dev5.4
* Origin: Institute for High Energy Physics, Protvino, Russia (2:5020/400)
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