Unable to ping the gateway IP itself


 
Thread Tools Search this Thread
Special Forums IP Networking Unable to ping the gateway IP itself
# 1  
Old 01-28-2007
Unable to ping the gateway IP itself

We are unable to bring one of our linux boxes into the network once it was restarted. But once we stop and start the network service. We are able to ping the gateway and get into network. After a minute or two we get the following reponse for the ping command

64 bytes from 124.168.215.40: icmp_seq=0 ttl=116 time=206.8 ms (DUP!)
64 bytes from 124.168.215.40: icmp_seq=0 ttl=115 time=216.8 ms (DUP!) ...

After this the server gets disonnected from the network.

Please help in resolving this issue.

Regards,
Antony
# 2  
Old 01-28-2007
hello,

you have duplicate IP inside your network.

cheers Smilie
# 3  
Old 01-29-2007
Thanks for the reply.

Even some of my friends suggested that there is a duplicate IP.

The link in the ethernet card was in Half duplex mode. This was the issue. Once it was changed to Full Duplex the issue was resolved. But do u have any idea why did it give a message which is similar to the duplicate IP?
# 4  
Old 01-30-2007
hello,

the theory of CSMA/CD - NIC will listen to link whether it is clear to transmit data or not. If it founds any traffic it will wait and check for whom the traffic destined - otherwise its turn to send data. If at the time it send data and anyone else do the same - it will drop the traffic and tell you DUP.

BUT - this is not the case - since modern NIC or OS have autonego option (or even auto-MDIX for switches) - it listen to the HUB/SWITCH what mode they operate.

i think you still should check any DUP IP.

cheers...
# 5  
Old 01-31-2007
Hi,

The issue is not there anymore...and I am sure there is no duplicate IP in the network. Also I cross checked the same with our network team.

Regards,
Anony
# 6  
Old 02-16-2007
We have a similar problem in some linux boxes on our network, they have dual ethernet with vlan support through bonding driver in active-backup mode on a cisco catalyst switched LAN (with trunk support). Although we think that this is some problem with the multicast filter on the switch, we can't still find out what the real problem is.
The other case is a strange delay after starting both interfaces, that takes about 30 seconds to being able to ping any host on the LAN... I've heard that is a "normal behaviour" on some Cisco switches.
# 7  
Old 02-16-2007
Even our linux was having the dual card and was facing the same issue. Thanks for confirming that the issue was with the Cisco switch. Please share with me if you have any document related to this.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Unable to ping default gateway

I have setup a Linux machine on my server but for some reason Im unable to reach my default gateway. This is causing me to not communicate with the outside world (unable to connect to CentOS repos) # ifconfig enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet... (3 Replies)
Discussion started by: Junaid Subhani
3 Replies

2. AIX

Networking Issue (Cant Ping the gateway)

Hi, I installed AIX 7.1 on a blade though (hmc with vio). I can ping the IP address, but not the gateway. Is there anything that I should configure? Is there anything that I have to check with vio setting or Am I missing any configuration? Please let me know further. Thank you (5 Replies)
Discussion started by: pjeedu2247
5 Replies

3. Red Hat

Can not ping default gateway

Hi, Here is the issue: There are 2 identical systems in the same subnet here. They can ping and ssh each other. One can ping the default gateway and one can not with error '... icmp_seq Destination Host Unreachable'. I can't find any difference between the two systems in terms of network... (4 Replies)
Discussion started by: aixlover
4 Replies

4. AIX

Cant ping default gateway aix 53 07 new install

I just reinstalled a fresh install of 5300 07 on an old 44p model 170, after installing I set an IP Address on en2 and I tried to the ping default gateway, no response. I tried a startsrc -g tcpip ... and then I can ping the default gateway. I broke the ping and tried again to ping. I cannot... (1 Reply)
Discussion started by: asyed123
1 Replies

5. UNIX for Dummies Questions & Answers

Cannot ping default gateway

I have NCR MP-RAS unix. I have been trying for several months to get our network working since we had never used it before. I have setup all routes that I can think of. I know it has something to do with the routing table, because out of sheer luck I was able to get it working, and than like a... (4 Replies)
Discussion started by: Rutgerncas
4 Replies

6. AIX

IBM Server doesn't ping gateway unless you put a static route

Just want to know if someone has a clue about what could be happening here: I have an AIX box with four NICs in Ether channel connected to a Cisco Switch. When I try to ping the default gateway, sometimes it works, but sometimes it doesn't work unless it has a defined static route. Thanks... (1 Reply)
Discussion started by: witt
1 Replies

7. Red Hat

Cannot ping gateway

I know the subject line is very similar to: destination host unreachable but the problem with my machine appears to be somewhat different from that thread. apologies if I missed something from there. We recently moved a machine physically and from one subnet to another . I used... (1 Reply)
Discussion started by: mirage
1 Replies

8. AIX

Can not Ping Gateway

Hello, I am new to Unix :D and have been trying to configure an AIX server running 5.3. I used smitty or smit to configure interface 0 on the server. I am able to ping the IP I set, however I am still unable to ping the gateway. I configured the IP by navigating to Communications Applications... (6 Replies)
Discussion started by: cdub50
6 Replies

9. Solaris

ping -s to default gateway very slow

I was install new solaris10 on m4000 model after that i "ping -s" to default gateway but it's take longtime (2 Min) to reply and if i use "ping" only it's reply to fase(2 sec). any body who can tell me about my problem and how to fix it please. i'm try to fix several days. (2 Replies)
Discussion started by: cesmk
2 Replies

10. IP Networking

Multihomed can not ping gateway

Hello this is my first post at this forum. Apologize for my lack of network understanding but Im posting to learn. I have a problem reaching default gateway 10.18.110.1 If I use my laptop I can ping 10.18.110.1 but with our red hat multihomed server the gateway does not respond to ping. cat... (11 Replies)
Discussion started by: vettec3
11 Replies
Login or Register to Ask a Question