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I have problem with Traceroute

Hi all

I have Linux servers and router for voice all in same vlan connected to core switch 4500  direct when i Tracert server ip from my PC or frome core there is one server will reatch to core and geve ***

this problem just only on one server other servers and Router is  okay and i check the CDP for all interface is UP

Thanks

12 REPLIES

Re: I have problem with Traceroute

Hi all

I have Linux servers and router for voice all in same vlan connected to core switch 4500 direct when i Tracert server ip from my PC or frome core there is one server will reatch to core and geve ***

this problem just only on one server other servers and Router is  okay and i check the CDP for all interface is UP

Thanks

Need some clarfication where is this server is located is it in different vlan and is connected to different switch.

Ganesh.H

Re: I have problem with Traceroute

Hi

Ganesh.H

The server connect to core switch direct and in the same VLAN

Re: I have problem with Traceroute

Hi

How may NIC you are using for that server.

Please can you check that routing table for that particular server & Compare with any other server.

Regards

Chetan Kumar

Re: I have problem with Traceroute

Hi

Chetan Kumar

There is tow interface cards in this server connected to same switch.

from the switch i can ping the tow interfaces and vice versa.

Thanks

alkaff

Re: I have problem with Traceroute

Hi

Ganesh.H

The server connect to core switch direct and in the same VLAN

If it is directly connected with the switch it should ping from the switch if you have configured svi for that vlan and check are you able to learn the mac-address of the server in switch.

And also check are you able to ping from server to switch or any other server in the same vlan.

Hope to Help !!

Ganesh.H

Re: I have problem with Traceroute

Hi

I can ping from both side . regarding the mac address switch learn for one interface

show the result of command:


ELC-CORE-1#sh mac-address-table int g3/5
Unicast Entries
vlan   mac address     type        protocols               port
-------+---------------+--------+---------------------+--------------------
  30    0023.7d93.a08e   dynamic ip                    GigabitEthernet3/5

Multicast Entries
vlan    mac address     type    ports
-------+---------------+-------+--------------------------------------------
  30    ffff.ffff.ffff   system Gi2/1,Gi2/2,Gi2/3,Gi2/4,Gi2/5,Gi2/6,Gi3/3
                                Gi3/4,Gi3/5,Gi3/6,Gi3/7,Gi3/8,Gi3/17,Gi3/24
                                Te1/2,Switch

ELC-CORE-1#sh mac-address-table int g3/7
Multicast Entries
vlan    mac address     type    ports
-------+---------------+-------+--------------------------------------------
  30    ffff.ffff.ffff   system Gi2/1,Gi2/2,Gi2/3,Gi2/4,Gi2/5,Gi2/6,Gi3/3
                                Gi3/4,Gi3/5,Gi3/6,Gi3/7,Gi3/8,Gi3/17,Gi3/24
                                Te1/2,Switch

Thanks

Re: I have problem with Traceroute

Hi

I can ping from both side . regarding the mac address switch learn for one interface

show the result of command:


ELC-CORE-1#sh mac-address-table int g3/5
Unicast Entries
vlan   mac address     type        protocols               port
-------+---------------+--------+---------------------+--------------------
  30    0023.7d93.a08e   dynamic ip                    GigabitEthernet3/5

Multicast Entries
vlan    mac address     type    ports
-------+---------------+-------+--------------------------------------------
  30    ffff.ffff.ffff   system Gi2/1,Gi2/2,Gi2/3,Gi2/4,Gi2/5,Gi2/6,Gi3/3
                                Gi3/4,Gi3/5,Gi3/6,Gi3/7,Gi3/8,Gi3/17,Gi3/24
                                Te1/2,Switch

ELC-CORE-1#sh mac-address-table int g3/7
Multicast Entries
vlan    mac address     type    ports
-------+---------------+-------+--------------------------------------------
  30    ffff.ffff.ffff   system Gi2/1,Gi2/2,Gi2/3,Gi2/4,Gi2/5,Gi2/6,Gi3/3
                                Gi3/4,Gi3/5,Gi3/6,Gi3/7,Gi3/8,Gi3/17,Gi3/24
                                Te1/2,Switch

Thanks

As narendra said can you brief with scehmatic diagram now where are you getting rto when ever you are pinging this server.

Ganesh.H

Re: I have problem with Traceroute

I would appreciate you to eloborate on this issue.

Rgds,

Narendrakumar B

Re: I have problem with Traceroute

Hi

I am attached herewith the network design it is very simple.

Re: I have problem with Traceroute

Hi

I am attached herewith the network design it is very simple.

           
        Attachments:                

Hi,

If all are in same vlan and is directly connected with switch what OS is running on the problematic server and is any firewall or anti virus is running on that server,If possible can you take capture for that server when ever you tarcert the servip from other servers.

and i dont have visio to see the attacehd diagram.

Hope to Help !!

Ganesh.H

Re: I have problem with Traceroute

Hi

The OS is Linux the firewall is disable and there is no anti virus. When I trace from the problematic server I reach to core switch and servers

I send doc with capture i hope it's clear

Re: I have problem with Traceroute

Hi

The OS is Linux the firewall is disable and there is no anti virus. When I trace from the problematic server I reach to core switch and servers

I send doc with capture i hope it's clear

Attachments:

Really strange but it is sure it related to linux server specific as traceroute packet will be reaching till linux server and as far my knowledge some devices will prevent traceroute packets directed at their interfaces, but will allow ICMP packets. Using traceroute with a -I flag forces traceroute to use ICMP packets that may go through.

And i dont think you would be facing any problem with the application running on these servers it just trace route packet issue with this server.

Hope to Help !!

Ganesh.H

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