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- About iamtheone12345
08-18-2017
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Member since
08-24-2011
58
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10
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10-27-2012
06:06 AM
Hi Karsten, Thank you for taking your time to explain the answer.Your answer seems to be logical and makes sense.What i am surprised is that the cisco documentation on swicthes and routers are very misleading.They claim that swicth is a layer 2 device and router is a layer 3 device.Clearly its just their normal operation.They could certainly do more!!!!!! Thank you gain. Regards, Arjun Das
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10-27-2012
04:00 AM
Hi Guys, I have a question.We all know the OSI model has 7 layers. Application presentation Session transport Network datalink and physical Tranport layer PDU is called Segment.When a host sends data the first 3 layers send the data down to the transport layer. The transport layer adds a segment header to the data and sends the segment it to network layer.The network layer encapsulates the segment header and data with a ip header and passes the packet it to data link layer.The data link layer encapulates the ip header with a frame header and trailer nad passes the frame to the physical layer.The physcial layer transmits the frame in form of bits on the wire.We know the port information is acutally on the transport layer segment header, When a router on the network recieves this frame ,it rips of the frame header and inspects the ip packet to see the source and destination ip address. MY question is suppose the router has an access list(inbound) to block a ip packets source ip x.x.x.x. any port to destination ip x.x.x.x port 80,Since it doesnt have visibility to the transport layer which has the port ino how does the router decide to filter the packet even though the ip packet doesnt have port information.The ip packet encapsulates the segment header? May be my concept of OSI model isnt clear.Anybody is welcome to teach me. Thanks guys
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05-30-2012
08:13 PM
So Nik what you are saying is that the middle switch wont forward traffic from swicth1 vlan 10 to swicth 3 vlan 10 as the middle switch(swicth 2) doesnt have vlan 10?? It would be great if you could provide me link of a cisco documentation.
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05-30-2012
06:23 PM
The swicth was always on VTP transparent mode.The vlans are deleted.just to make sure i erased startup config and vlan.dat after deleting the Vlans.Then suspecting that the vlan database may not have been erased i replaced the swicth in the middle with a completely new switch and configured it as a transparent switch.It is still passing tarffic for vlans that it doesnt have. Can you provide me documentation that suggests otherwise.
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05-30-2012
08:32 AM
Well i would have thought so. But in my packet tracer lab it seems to be working. I mean the switch in the middle is forwarding traffic for vlan 10 and 20 and native vlan even though it itself doesnt have any of those vlans. When i deleted those vlans 10,20 from the swicth in the middle ,i also deleted the vlan.dat file from the swicth and reloaded the switch to make sure that the vlans are deleted.I also made the swicth in the middle work in vtp transparent mode so that it doesnot learn the vlans passed in VTP updates by swicth1. But logically thinking.....the switch has trunk links on either side (one side switch1 and the other side switch 3).Isnt that the reason the trunk links are meant for ? So it should be passing the vlan 10 and vlan 20 traffic even though it doesnt have those vlan right ???By the way the swicth3 and router on stick link is also a trunk link. If anybody wants the PT file i can attach it. Just to make sure everybody understands what i am doing is:A PC in vlan 10 connected to swicth1 is trying to ping a PC in vlan 10 connected to switch3 via switch2 which doesnot have vlan 10.
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05-30-2012
05:11 AM
Hi Guys, I have 3 swicthes connected each with vlans 10,20,30 conncted to a router on stick which has proper subinterfaces for inter vlan routing. the toplogy is something like this : swicth1------switch2------switch3------->router on stick All the trunk ports have been properly configured. Now i have 3 PC's in 3 differnt subnets (corresponding to each of the 3 vlans) connected to the 3 switches so that i can test the inter vlan routing. It works fine. My question is,What if i delete vlan 10,20 and 30 from the swicth2 (the switch in the middle of 2 swicthes).Will it forward vlan traffic for a PC say in vlan 10 connected to switch1to a PC in vlan10 connected to the swicth3 ? Will switch2 forward traffic for a vlan which it doesnot have ? regards, Arjun Das
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- Tags:
- vlan
Labels:
05-29-2012
09:02 PM
Hi Guys, Thanks.the only problem i am having is to understand on what basis you are selecting the metric. For example: router rip redistribute eigrp 100 metric 10 Here metric 10 was selected on what basis.I know rip has 15 hops as maximum hop count.So how do you relate this . then again: router eigrp 100 redistribute rip metric 1 1 1 1 1 On what basis the 5 vlaues in the metric are chosen ? The document provided just gives examples of how to advertize.But it doesnt throw any light on how the metrics are to be selected on the basis of routing protocols.
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05-29-2012
03:55 AM
hi nikolay, i read the document.for some reason...i am not being able to understand it.if i provide the PT lab will you have a look at it? regards, arjun
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05-29-2012
03:21 AM
Hi guys, I have 2 networks connected in corporate environment. One network is running EIGRP. The other is running rip version 2. I have a border router running both eigrp and rip -2. How do i make these 2 networks exchange routes ? I do not want to configure a static route from one network to the other. I heard you can redistribute eigrp into RIP network and RIP into Eigrp network. If so,How do you do that..i tried a few things in packet tracer,but it doesnt work. regards, Arjun Das Engineer-Network
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05-01-2012
08:52 AM
Hi richard, By the way i am now running RIP-1 in this lab.No static routes configured.I am using RIP in all routers. used ip default-network on CBTrouter to point to 2 networks as candidate for default route.
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05-01-2012
08:47 AM
Hi Richard, All the details are below:(the topology is attached ) CBTRouter config ================ CBTrouter#show run Building configuration... hostname CBTrouter ! ! ! interface FastEthernet0/0 description ###INTERNET ROUTER CONNCETION### ip address 192.168.1.1 255.255.255.0 duplex auto speed auto ! interface FastEthernet0/1 no ip address duplex auto speed auto shutdown ! interface Serial1/0 ip address 68.110.171.98 255.255.255.224 no cdp enable clock rate 64000 ! interface Serial1/1 ip address 100.110.171.98 255.255.255.0 clock rate 64000 ! interface Serial1/2 no ip address ! interface Serial1/3 no ip address ! router rip network 68.0.0.0 network 100.0.0.0 network 192.168.1.0 ! ip classless ip default-network 4.0.0.0 ip default-network 5.0.0.0 ! end CBTrouter#show ip route Gateway of last resort is 68.110.171.97 to network 4.0.0.0 R* 4.0.0.0/8 [120/1] via 68.110.171.97, 00:00:16, Serial1/0 R* 5.0.0.0/8 [120/1] via 100.110.171.97, 00:00:21, Serial1/1 68.0.0.0/27 is subnetted, 1 subnets C 68.110.171.96 is directly connected, Serial1/0 100.0.0.0/24 is subnetted, 1 subnets C 100.110.171.0 is directly connected, Serial1/1 C 192.168.1.0/24 is directly connected, FastEthernet0/0 R 192.168.2.0/24 [120/1] via 192.168.1.2, 00:00:24, FastEthernet0/0 R 192.168.3.0/24 [120/2] via 192.168.1.2, 00:00:24, FastEthernet0/0 R1 config =========== R1#show run hostname R1 ! ! interface FastEthernet0/0 ip address 192.168.1.2 255.255.255.0 duplex auto speed auto ! interface FastEthernet0/1 no ip address duplex auto speed auto shutdown ! interface Serial1/0 ip address 192.168.2.1 255.255.255.0 clock rate 64000 ! interface Serial1/1 no ip address ! interface Serial1/2 no ip address ! interface Serial1/3 no ip address ! interface Vlan1 no ip address shutdown ! router rip network 192.168.1.0 network 192.168.2.0 ! ip classless ! end R1#show ip route Gateway of last resort is not set R 4.0.0.0/8 [120/2] via 192.168.1.1, 00:00:18, FastEthernet0/0 R 5.0.0.0/8 [120/2] via 192.168.1.1, 00:00:18, FastEthernet0/0 R 68.0.0.0/8 [120/1] via 192.168.1.1, 00:00:18, FastEthernet0/0 R 100.0.0.0/8 [120/1] via 192.168.1.1, 00:00:18, FastEthernet0/0 C 192.168.1.0/24 is directly connected, FastEthernet0/0 C 192.168.2.0/24 is directly connected, Serial1/0 R 192.168.3.0/24 [120/1] via 192.168.2.2, 00:00:13, Serial1/0 R2 config ============== R2#show run hostname R2 ! interface FastEthernet0/0 ip address 192.168.3.1 255.255.255.0 duplex auto speed auto ! interface FastEthernet0/1 no ip address duplex auto speed auto shutdown ! interface Serial1/0 ip address 192.168.2.2 255.255.255.0 ! interface Serial1/1 no ip address ! interface Serial1/2 no ip address ! interface Serial1/3 no ip address ! interface Vlan1 no ip address shutdown ! router rip network 192.168.2.0 network 192.168.3.0 ! ip classless ! ! end R2#show ip route Gateway of last resort is not set R 4.0.0.0/8 [120/3] via 192.168.2.1, 00:00:23, Serial1/0 R 5.0.0.0/8 [120/3] via 192.168.2.1, 00:00:23, Serial1/0 R 68.0.0.0/8 [120/2] via 192.168.2.1, 00:00:23, Serial1/0 R 100.0.0.0/8 [120/2] via 192.168.2.1, 00:00:23, Serial1/0 R 192.168.1.0/24 [120/1] via 192.168.2.1, 00:00:23, Serial1/0 C 192.168.2.0/24 is directly connected, Serial1/0 C 192.168.3.0/24 is directly connected, FastEthernet0/0 ISPRouter config =================== ISProuter#show run hostname ISProuter ! ! interface Loopback1 ip address 4.2.2.1 255.255.255.0 ! interface FastEthernet0/0 no ip address duplex auto speed auto shutdown ! interface FastEthernet0/1 no ip address duplex auto speed auto shutdown ! interface Serial1/0 ip address 68.110.171.97 255.255.255.224 ! interface Serial1/1 no ip address ! interface Serial1/2 no ip address ! interface Serial1/3 no ip address ! interface Vlan1 no ip address shutdown ! router rip network 4.0.0.0 network 68.0.0.0 ! ip classless ! end ISProuter#show ip route Gateway of last resort is not set 4.0.0.0/24 is subnetted, 1 subnets C 4.2.2.0 is directly connected, Loopback1 R 5.0.0.0/8 [120/2] via 68.110.171.98, 00:00:20, Serial1/0 68.0.0.0/27 is subnetted, 1 subnets C 68.110.171.96 is directly connected, Serial1/0 R 100.0.0.0/8 [120/1] via 68.110.171.98, 00:00:20, Serial1/0 R 192.168.1.0/24 [120/1] via 68.110.171.98, 00:00:20, Serial1/0 R 192.168.2.0/24 [120/2] via 68.110.171.98, 00:00:20, Serial1/0 R 192.168.3.0/24 [120/3] via 68.110.171.98, 00:00:20, Serial1/0 ISPRouter2 config ============== ISPRouter2#show run hostname ISPRouter2 ! ! interface Loopback1 ip address 5.2.2.1 255.255.255.0 ! interface FastEthernet0/0 no ip address duplex auto speed auto shutdown ! interface FastEthernet0/1 no ip address duplex auto speed auto shutdown ! interface Serial1/0 ip address 100.110.171.97 255.255.255.0 ! interface Serial1/1 no ip address shutdown ! interface Serial1/2 no ip address shutdown ! interface Serial1/3 no ip address shutdown ! interface Vlan1 no ip address shutdown ! router rip network 5.0.0.0 network 100.0.0.0 ! ip classless ! ! end ISPRouter2#show ip route Gateway of last resort is not set R 4.0.0.0/8 [120/2] via 100.110.171.98, 00:00:25, Serial1/0 5.0.0.0/24 is subnetted, 1 subnets C 5.2.2.0 is directly connected, Loopback1 R 68.0.0.0/8 [120/1] via 100.110.171.98, 00:00:25, Serial1/0 100.0.0.0/24 is subnetted, 1 subnets C 100.110.171.0 is directly connected, Serial1/0 R 192.168.1.0/24 [120/1] via 100.110.171.98, 00:00:25, Serial1/0 R 192.168.2.0/24 [120/2] via 100.110.171.98, 00:00:25, Serial1/0 R 192.168.3.0/24 [120/3] via 100.110.171.98, 00:00:25, Serial1/0
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05-01-2012
04:47 AM
Hi Guys, I am having some issues with ip default-network command on packet tracer. I have a toplogy of few routers running rip version 2. I have configured ip default network command on one router pointing to to candiddate networks (2 sepearte static routes with 2 separate ip default-network command.)The command seems to work properly as i can reach an outside network via one candidate network only at one time(the one that is first in the routing table). However ,the RIP-2 is not propogating the ip default-network static routes to other routers.Am i doing something wrong here ?Should i be using RIP rather than RIP-2 ? i have pointed classfull networks in the ip default-network command. If any one wants to look at the PT file i can certainly attach it. Regards, Arjun Das
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- Tags:
- default-network
- ip
Labels:
04-30-2012
05:34 AM
Hi Richard, Thanks.Just after i posted the last message i knew what i was missing.The route back for ping packet.Thank you very much for pointing me to the right direction. I wanted to know another thing.Is it true that serial links between 2 routers (like R1 and R2 here) with ppp encapsulation doesnt require serial interfaces on either side to have ip addresses configured for PC1 to ping PC2 ? Regards, Arjun Das
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04-29-2012
07:56 PM
Please ignore the last post ====================== Hi Richard, well.I am missing something here.The tracert from PC1 to PC2 shows that it is going through R1.That means the router does know the route to 192.168.2.0 network.I undersatnd your point that R1 doesnot know the route to 40.1.1.2 which is the s1/0 interface of R2.however,R1 is not being able to ping PC2 either.Now why is that ?? R1#ping 192.168.2.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.2.2, timeout is 2 seconds: ..... Success rate is 0 percent (0/5) R2#show ip route Gateway of last resort is not set 20.0.0.0/24 is subnetted, 1 subnets C 20.1.1.0 is directly connected, Serial1/0 C 192.168.1.0/24 is directly connected, FastEthernet0/0 S 192.168.2.0/24 is directly connected, Serial1/0 clearly there is a route from R1 to 192.168.2.0 network. regards, Arjun Das
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10-27-2012
Hi Karsten,Thank you for taking your time to explain the answer.Your
answer seems to be logical and ...
10-27-2012
Hi Guys,I have a question.We all know the OSI model has 7
layers.Application presentationSession tra...
05-30-2012
So Nik what you are saying is that the middle switch wont forward
traffic from swicth1 vlan 10 to sw...
05-30-2012
The swicth was always on VTP transparent mode.The vlans are deleted.just
to make sure i erased start...
05-30-2012
Well i would have thought so.But in my packet tracer lab it seems to be
working.I mean the switch in...
05-30-2012
Hi Guys,I have 3 swicthes connected each with vlans 10,20,30 conncted to
a router on stick which has...
05-29-2012
Hi Guys,Thanks.the only problem i am having is to understand on what
basis you are selecting the met...
05-29-2012
hi nikolay,i read the document.for some reason...i am not being able to
understand it.if i provide t...
05-29-2012
Hi guys,I have 2 networks connected in corporate environment.One network
is running EIGRP.The other ...
05-01-2012
Hi richard,By the way i am now running RIP-1 in this lab.No static
routes configured.I am using RIP ...
05-01-2012
Hi Richard,All the details are below:(the topology is attached
)CBTRouter config================CBTr...
05-01-2012
Hi Guys,I am having some issues with ip default-network command on
packet tracer.I have a toplogy of...
04-30-2012
Hi Richard,Thanks.Just after i posted the last message i knew what i was
missing.The route back for ...
Public Statistics
| Date Registered | 08-24-2011 08:57 PM |
| Date Last Visited | 08-18-2017 03:53 AM |
| Total Messages Posted | 58 |
| Total Helpful Votes Received | 10 |
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