الى خبراء الشبكات - الرجاء المساعدة

[Athina]

I am studying CCNA security course, I need your help with issue in
i created this topology :
1x ADSL Router : 192.168.1.1
1x Host Machine : 192.168.1.2
1x Cisco c2691 Router : 192.168.1.100
1x Cisco C7200 Router : 192.168.1.200

Here is the Ping Test:

R1:192.168.1.100

R1#ping 192.168.1.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/19/28 ms
R1#
R1#ping 192.168.1.200

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.200, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/28/64 ms
R1#
R1#ping 192.168.1.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R1#


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The Problem is that i can`t ping from the cisco routers to my host pc to be able to use ccp , while i can ping from cisco((1.100)or (1.200)) to vodafone adsl router(1.1)
Please Answer me ASAP or call me at 01093030410

Thanks and best Regards.

[Eng\M.said]

R1#ping 192.168.1.1

باشا المفروض ده DSL

طيب جرب تبنج عليه من الهوست وخلى getway R1 لان المفروض topology مفهاش حاجة

[Athina]

المشكلة باختصار يابشمهندس محمد ان انا مش عارف ابينج من راوترات سييكو ال ف ال gns على الهوست - لكن فنفس الوقت عارف ا بينج على راوتر النت العادى 1.1
vodafone - host - ok
cisco - vodafone - ok
cisco - host - not ok

[Athina]

R1#show arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 192.168.1.100 - c000.178c.0000 ARPA FastEthernet0/0
Internet 192.168.1.1 0 00e0.4d36.2ed8 ARPA FastEthernet0/0
Internet 192.168.1.2 3 e411.5b5f.23e5 ARPA FastEthernet0/0
R1#ping 192.168.1.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R1#

7aga tanya ana kont 3ayez a3raf ezay a save el router configuration f el gns , 3ashan kol mara b restart el gns , lazem a3ml configure ll router tany

[Eng\M.said]

طيب بوص ياباشا اعمل على الراوتر الامر ده واكتب result

debug ip packet detail

debug ip icmp

وبعدين

ping 192.168.1.2

[Athina]

R1#debug ip packet detail
IP packet debugging is on (detailed)
R1#debug ip icmp
ICMP packet debugging is on
R1#ping 192.168.1.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds:

*Mar 1 00:03:14.899: IP: tableid=0, s=192.168.1.150 (local), d=192.168.1.2 (FastEthernet0/0), routed via FIB
*Mar 1 00:03:14.899: IP: s=192.168.1.150 (local), d=192.168.1.2 (FastEthernet0/0), len 100, sending
*Mar 1 00:03:14.899: ICMP type=8, code=0.
*Mar 1 00:03:16.899: IP: tableid=0, s=192.168.1.150 (local), d=192.168.1.2 (FastEthernet0/0), routed via FIB
*Mar 1 00:03:16.899: IP: s=192.168.1.150 (local), d=192.168.1.2 (FastEthernet0/0), len 100, sending
*Mar 1 00:03:16.903: ICMP type=8, code=0.
*Mar 1 00:03:18.899: IP: tableid=0, s=192.168.1.150 (local), d=192.168.1.2 (FastEthernet0/0), routed via FIB
*Mar 1 00:03:18.899: IP: s=192.168.1.150 (local), d=192.168.1.2 (FastEthernet0/0), len 100, sending
*Mar 1 00:03:18.903: ICMP type=8, code=0.
*Mar 1 00:03:20.899: IP: tableid=0, s=192.168.1.150 (local), d=192.168.1.2 (FastEthernet0/0), routed via FIB
*Mar 1 00:03:20.899: IP: s=192.168.1.150 (local), d=192.168.1.2 (FastEthernet0/0), len 100, sending
*Mar 1 00:03:20.899: ICMP type=8, code=0.
*Mar 1 00:03:22.899: IP: tableid=0, s=192.168.1.150 (local), d=192.168.1.2 (FastEthernet0/0), routed via FIB
*Mar 1 00:03:22.899: IP: s=192.168.1.150 (local), d=192.168.1.2 (FastEthernet0/0), len 100, sending
*Mar 1 00:03:22.903: ICMP type=8, code=0.
Success rate is 0 percent (0/5)

[Athina]

da el skype bta3y : v_romantic_p
low 7adretak 3ndak wa2t tdkhol team viewer m3aya

Thx

[Athina]

ana l7ad now ma nemtch w bgad mesh 3aref anam el mawdo3 da hyakol dmaghy

[Athina]

I found that this is a common issue, i found this solution in the internet:


"I finally found a solution to this mess. I couldn't ping my virtual cisco pix running in GNS3 from my host (Windows 7 64 bit). In XP I could. What I finally realized was that even wireshark was reporting bad checksums. After some heavy digging I ran into this wiki on the wireshark site https://wiki.wireshark.org/CaptureSetup/Offloading.TCP, UDP, and IP checksumming being offloaded to the nic card is killing us all. Cool feature but something that really F's up WinPCAP. If the OS is no longer doing the packet checksums it appears to all software using WinPCAP that the packet is bad and it just drops. As soon as I disabled this feature on my laptop so that the OS does the checksumming again everything works great again. SNORT also suffered from this issue which is why I'm heading to their support forum next. On my machine to turn off Offloading I did the following: In Windows, go to Control Panel->Network and Internet -> Network and Sharing Center, click Local Area Connection Link of the connection to change then choose 'Properties' button. Press the 'Configure...' button, choose the 'Advanced' tab to modify the "IP V4 Checksum Offload" and "TCP Checksum Offload (IPV4)" and "UDP Checksum Offload (IPV4)". I changed the setting from RX and TX Enable to Disabled so that the OS will compute the checksum. Note: I had to reboot my machine after the setting changes. Hope this works for you as it did for me""

But it didn`t work with me, so i installed winxp in VMmachine , and finally it`s working




Thanks so much for your effort to help me, i wish we can talk again

skype: v_romantic_p
facebook: eng.mahmoud@Hotmail.it

[Eng\M.said]

باشا تحت امرك انا عملت نفس التبولوجى دى عندى ومكنش فى اى مشكلة وتحت امرك فى اى وقت

skype : saidyy69