DHCP server è ðîóòåð Asus

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08-02-2010, 10:54
gurush

ß âîò äóìàþ, à ìîæíî ëè ïîäñóíóòü èäåíòè÷íûé çàïðîñ DHCP êëèåíòó ðîóòåðà? Ïîòîìó êàê, íà ìîé íåïðîñâÿùåííûé âçãëÿä, ñóùåñòâåííûõ îòëè÷èé íåò - ÿ ïîñìîòðåë ñåé÷àñ áèíàðíèê íà ïðåäìåò ñîîòâåòñòâèÿ ñòàíäàðòó - îòëè÷èÿ òîëüêî â íàáîðå îïöèé, íî îíè âïîëíå ëåãèòèìíûå
08-02-2010, 11:08
lly

Quote:

Originally Posted by gurush

Â ïðèëîæåíèè êàê âûãëÿäèò ñîîáùåíèå, îòïðàâëÿåìîå êîìïüþòåðîì, íà êîòîðîå ïðèõîäèò ïîëîæèòåëüíûé îòâåò

Íà ñêðèíøîòå íå âèäåí íàáîð ôëàãîâ, à â öåëîì íå âèæó íè÷åãî ïîäîçðèòåëüíîãî, çà èñêëþ÷åíèåì ÷òî ïðèâåäåííûé çàïðîñ ýòî RENEW, ò.ê. ïðîñÿò ïî âîçìîæíîñòè ïðîäëèòü àðåíäó.

Ìîæíî ïîïðîáîâàòü ïîèãðàòüñÿ ñ êëþ÷àìè udhcpc íà ðîóòåðå, ïîçàäàâàòü -H è -F (îïöèè 12 è 81)

P.S. À ëó÷øå êîïèïàñòèòü òåêñò, ÷åì ãðàôèêó!
08-02-2010, 12:22
gurush

Ïîíÿë íàêîíåö êàê èç wireshark âûòàùèòü òåêñò.
Âîò òàêîé âîò çàïðîñ îò êîìïüþòåðà ïðîõîäèò

No. Time Source Destination Protocol Info
8 4.026663 0.0.0.0 255.255.255.255 DHCP DHCP Request - Transaction ID 0x47b741f5

Frame 8 (350 bytes on wire, 350 bytes captured)
Arrival Time: Feb 4, 2010 23:04:53.483773000
[Time delta from previous captured frame: 0.796568000 seconds]
[Time delta from previous displayed frame: 0.796568000 seconds]
[Time since reference or first frame: 4.026663000 seconds]
Frame Number: 8
Frame Length: 350 bytes
Capture Length: 350 bytes
[Frame is marked: False]
[Protocols in frame: eth:ip:udp:bootp]
[Coloring Rule Name: UDP]
[Coloring Rule String: udp]
Ethernet II, Src: AsustekC_96:fb:0f (00:1a:92:96:fb:0f), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
Internet Protocol, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
Bootstrap Protocol
Message type: Boot Request (1)
Hardware type: Ethernet
Hardware address length: 6
Hops: 0
Transaction ID: 0x47b741f5
Seconds elapsed: 0
Bootp flags: 0x0000 (Unicast)
Client IP address: 0.0.0.0 (0.0.0.0)
Your (client) IP address: 0.0.0.0 (0.0.0.0)
Next server IP address: 0.0.0.0 (0.0.0.0)
Relay agent IP address: 0.0.0.0 (0.0.0.0)
Client MAC address: AsustekC_96:fb:0f (00:1a:92:96:fb:0f)
Client hardware address padding: 00000000000000000000
Server host name not given
Boot file name not given
Magic cookie: (OK)
Option: (t=53,l=1) DHCP Message Type = DHCP Request
Option: (t=61,l=7) Client identifier
Option: (t=50,l=4) Requested IP Address = 10.38.4.151
Option: (t=12,l=9) Host Name = "bigmobile"
Option: (t=81,l=13) Client Fully Qualified Domain Name
Option: (t=60,l=8) Vendor class identifier = "MSFT 5.0"
Option: (t=55,l=11) Parameter Request List
End Option
09-02-2010, 06:18
gurush

Ïîïðîáîâàë â÷åðà è òàê è ñÿê ïîçàïóñêàòü udhcpc - ñòàâèë ïàðàìåòðû ÷åðåç export, îïöèè óêàçûâàë, íî tcpdump âñå âðåìÿ ïîêàçûâàë îäèí è òîò æå ïàêåò - discover.
Âîïðîñ â ñëåäóþùåì - ìîæíî ëè êàê-ëèáî çàñòàâèòü udhcpc îòïðàâèòü íóæíîå ìíå ñîîáùåíèå - Request, à íå Discover?
09-02-2010, 11:23
lly

Quote:

Originally Posted by gurush

Âîïðîñ â ñëåäóþùåì - ìîæíî ëè êàê-ëèáî çàñòàâèòü udhcpc îòïðàâèòü íóæíîå ìíå ñîîáùåíèå - Request, à íå Discover?

Ýòî íåïðàâèëüíî! Ïðî÷òèòå åùå ðàç ÷òî ÿ âàì ïèñàë - Request ýòî ïðîäëåíèå àðåíäû(lease) àäðåñà, à íå åãî ïåðâîíà÷àëüíûé çàïðîñ.

ß ñëàá â âèíäàõ, íî ïî-ìîåìó ñýìóëèðîâàòü ïåðâîíà÷àëüíûé çàïðîñ ìîæíî âûïîëíèâ êîìàíäû:

Code:

ipconfig /release ipconfig /renew

P.S. Òàê è íå âèäíî ÷òî âî ôëàãàõ "Parameter Request List" ñ êîìïà.
09-02-2010, 12:15
gurush

Option: (t=55,l=11) Parameter Request List

01:0f:03:06:2c:2e:2f:1f:21:f9:2b

1 = Subnet Mask
15 = Domain Name
3 = Router
6 = Domain Name Server
44 = NetBIOS over TCP/IP Name Server
46 = NetBIOS over TCP/IP Node Type
47 = NetBIOS over TCP/IP Scope
31 = Perform Router Discover
33 = Static Route
249 = Private/Classless Static Route (Microsoft)
43 = Vendor-Specific Information

ß ïîíèìàþ, ÷òî Request ýòî ïðîäëåíèå àðåíäû, íî â ëþáîì ñëó÷àå îòâåòà ñåðâåðà íà ýòî request áóäåò äîñòàòî÷íî, ïî êðàéíåé ìåðå ÿ òàê äóìàþ, ÷òîáû âûñòàâèòü àäðåñ èíòåðôåéñó.
Åñëè ÿ ïîäñòàâëþ MAC àäðåñ êîìïüþòåðà, òî âîçìîæíî DHCP ñåðâåð íå çàìåòèò ïîäìåíû è âûäàñò ip-àäðåñ.
Ýòî íå áîëåå ÷åì èäåÿ - îñòàëüíîå ïîêà íå ïîìîãëî ...

P.S. À ãäå ëåæàò íà ðîóòåðå ñêðèïòû ê udhcpc ?
09-02-2010, 14:25
lly

Quote:

Originally Posted by gurush

ß ïîíèìàþ, ÷òî Request ýòî ïðîäëåíèå àðåíäû, íî â ëþáîì ñëó÷àå îòâåòà ñåðâåðà íà ýòî request áóäåò äîñòàòî÷íî, ïî êðàéíåé ìåðå ÿ òàê äóìàþ, ÷òîáû âûñòàâèòü àäðåñ èíòåðôåéñó.

ýòî ãðóáîå íàðóøåíèå ñòàíäàðòà, ïðåäëàãàþ âñ¸ æå èñïûòàòü ïåðâîíà÷àëüíîå ïîëó÷åíèå IP íà êîìïå.

Quote:

Åñëè ÿ ïîäñòàâëþ MAC àäðåñ êîìïüþòåðà, òî âîçìîæíî DHCP ñåðâåð íå çàìåòèò ïîäìåíû è âûäàñò ip-àäðåñ.

ïîïûòêà íå ïûòêà, ÿ òîæå íå ìîãó íà äàííûé ìîìåíò ïðèäóìàòü ÷òî-ëèáî êðîìå ïåðåáîðà.

Quote:

P.S. À ãäå ëåæàò íà ðîóòåðå ñêðèïòû ê udhcpc ?

íèãäå, âñ¸ âûçûâàåòñÿ èç áèíàðíèêà rc
10-02-2010, 08:18
gurush

Íà êîìïå ïîëó÷èëîñü:

No. Time Source Destination Protocol Info
887 235.664391 0.0.0.0 255.255.255.255 DHCP DHCP Discover - Transaction ID 0xc4ac6428

Frame 887 (342 bytes on wire, 342 bytes captured)
Ethernet II, Src: AsustekC_96:fb:0f (00:1a:92:96:fb:0f), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
Internet Protocol, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
Bootstrap Protocol
Message type: Boot Request (1)
Hardware type: Ethernet
Hardware address length: 6
Hops: 0
Transaction ID: 0xc4ac6428
Seconds elapsed: 0
Bootp flags: 0x0000 (Unicast)
Client IP address: 0.0.0.0 (0.0.0.0)
Your (client) IP address: 0.0.0.0 (0.0.0.0)
Next server IP address: 0.0.0.0 (0.0.0.0)
Relay agent IP address: 0.0.0.0 (0.0.0.0)
Client MAC address: AsustekC_96:fb:0f (00:1a:92:96:fb:0f)
Client hardware address padding: 00000000000000000000
Server host name not given
Boot file name not given
Magic cookie: (OK)
Option: (t=53,l=1) DHCP Message Type = DHCP Discover
Value: 01
Option: (t=116,l=1) DHCP Auto-Configuration [TODO]
Value: 01
Option: (t=61,l=7) Client identifier
Value: 01001A9296FB0F
Option: (t=50,l=4) Requested IP Address = 10.38.4.151
Value: 0A260497
Option: (t=12,l=9) Host Name = "bigmobile"
Value: 6269676D6F62696C65
Option: (t=60,l=8) Vendor class identifier = "MSFT 5.0"
Value: 4D53465420352E30
Option: (t=55,l=11) Parameter Request List
Value: 4D53465420352E30
1 = Subnet Mask
15 = Domain Name
3 = Router
6 = Domain Name Server
44 = NetBIOS over TCP/IP Name Server
46 = NetBIOS over TCP/IP Node Type
47 = NetBIOS over TCP/IP Scope
31 = Perform Router Discover
33 = Static Route
249 = Private/Classless Static Route (Microsoft)
43 = Vendor-Specific Information

End Option
Padding

Îòâåò ñåðâåðà:

No. Time Source Destination Protocol Info
890 235.873254 10.38.4.1 10.38.4.151 DHCP DHCP Offer - Transaction ID 0xc4ac6428

Frame 890 (364 bytes on wire, 364 bytes captured)
Ethernet II, Src: D-Link_12:ff:0b (00:19:5b:12:ff:0b), Dst: AsustekC_96:fb:0f (00:1a:92:96:fb:0f)
Internet Protocol, Src: 10.38.4.1 (10.38.4.1), Dst: 10.38.4.151 (10.38.4.151)
User Datagram Protocol, Src Port: bootps (67), Dst Port: bootpc (68)
Bootstrap Protocol
Message type: Boot Reply (2)
Hardware type: Ethernet
Hardware address length: 6
Hops: 2
Transaction ID: 0xc4ac6428
Seconds elapsed: 0
Bootp flags: 0x0000 (Unicast)
Client IP address: 0.0.0.0 (0.0.0.0)
Your (client) IP address: 10.38.4.151 (10.38.4.151)
Next server IP address: 0.0.0.0 (0.0.0.0)
Relay agent IP address: 10.38.4.1 (10.38.4.1)
Client MAC address: AsustekC_96:fb:0f (00:1a:92:96:fb:0f)
Client hardware address padding: 00000000000000000000
Server host name not given
Boot file name not given
Magic cookie: (OK)
Option: (t=53,l=1) DHCP Message Type = DHCP Offer
Value: 02
Option: (t=54,l=4) DHCP Server Identifier = 10.0.0.6
Value: 0A000006
Option: (t=51,l=4) IP Address Lease Time = 5 days
Value: 00069780
Option: (t=1,l=4) Subnet Mask = 255.255.254.0
Value: FFFFFE00
Option: (t=15,l=15) Domain Name = "users.trc.local"
Value: 75736572732E7472632E6C6F63616C
Option: (t=3,l=4) Router = 10.38.4.1
Value: 0A260401
Option: (t=6,l=8) Domain Name Server
Value: 0A0000780A0000B9
IP Address: 10.0.0.120
IP Address: 10.0.0.185
Option: (t=46,l=1) NetBIOS over TCP/IP Node Type = P-node
Value: 02
Option: (t=249,l=22) Private/Classless Static Route (Microsoft)
Value: 18C0A80A0A26040115C0A8000A260401080A0A260401
Subnet/MaskWidth-Router: 192.168.10.0/24-10.38.4.1
Subnet/MaskWidth-Router: 192.168.0.0/21-10.38.4.1
Subnet/MaskWidth-Router: 10.0.0.0/8-10.38.4.1
End Option
10-02-2010, 10:16
lly
Quote:

Originally Posted by gurush

Íà êîìïå ïîëó÷èëîñü:

Ñóïåð! Ïîõîæå ïðîâàéäåðñêèé DHCP òîæå âèíäîâûé.

Ò.ê. ÿ íå áîëüøîé çíàòîê ñòàíäàðòà DHCP, òî óâèäåòü ÷òî åìó íå íðàâèòüñÿ â çàïðîñå udhcpc ïîêà íå ìîãó. Åñëè åñòü âîçìîæíîñòü, ÿ áû ñäåëàë ñëåäóþùèå ýêñïåðèìåíòû:
- çàãðóçèë íà êîìïå êàêîé-íèáóäü LIVE-linux è ïîïðîáîâàë áû udhcpc èç busybox'à
- åñëè åñòü âîçìîæíîñòü, "ïðîèãðàòü" ïàêåò ïðè ïîìîùè tcpreplay
10-02-2010, 10:47
theMIROn

Quote:

Originally Posted by gurush

Subnet/MaskWidth-Router: 192.168.10.0/24-10.38.4.1
Subnet/MaskWidth-Router: 192.168.0.0/21-10.38.4.1
Subnet/MaskWidth-Router: 10.0.0.0/8-10.38.4.1

à ýòè äèàïàçîíû ìàðøðóòîâ ïî dhcp íå ïåðåñåêàþòñÿ ñ âàøèìè ëîêàëüíûìè?
10-02-2010, 11:10
gurush

×åñòíî ãîâîðÿ, ÿ íå áîëüøîé ñïåö â àäðåñàöèè:
Âíóòðåííÿÿ àäðåñàöèÿ ó ìåíÿ 192.168.1.0 è ìàñêà 255.255.255.0

Íî ÿ íå î÷åíü ïîíèìàþ êàê íàñòðîéêè WAN èíòåðôåéñà ìîãóò êîíôëèêòîâàòü ñ LAN.
10-02-2010, 11:37
theMIROn

äà, âîò åùå, ïîïðîáóéòå âêëþ÷èòü ôàéðâîë â web èíòåðôåéñå
10-02-2010, 13:41
Basile

Quote:

Originally Posted by gurush

Âíóòðåííÿÿ àäðåñàöèÿ ó ìåíÿ 192.168.1.0 è ìàñêà 255.255.255.0

Ïåðåñåêàåòñÿ ñ äèàïàçîíîì 192.168.0.0/21.
Âàì íåëüçÿ èñïîëüçîâàòü äèàïàçîíû 192.168.0.X - 192.168.7.X, 192.168.10.X è 10.X.X.X äëÿ âíóòðåííåé ñåòè
11-02-2010, 06:53
gurush

Ïîïðîáîâàë âêëþ÷èòü Firewall, ïîìåíÿë àäðåñàöèþ, íî íè÷åãî íå ïîìîãëî.
11-02-2010, 13:32
Basile

À âû ïðîáîâàëè ïðîïèñàòü MAC-àäðåñ ñâîåé ñåòåâîé êàðòû? Ïî-ìîåìó, çäåñü MAC âàøåãî ðîóòåðà:

Quote:

Originally Posted by gurush

Ethernet II, Src: D-Link_12:ff:0b (00:19:5b:12:ff:0b), Dst: AsustekC_96:fb:0f (00:1a:92:96:fb:0f)

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