Re: [Ilugc] Can not ping via switch consistently
2010/10/11 ராஜ பாண்டி : > Hi friends, > > I found that there is an internal switch in 192.168.48.9 server > system. The problem is with the port in internal switch. I changed the > port and now everything is fine. Thanks to all who spent time to clear > me. Thanks again. It is great that your problem is solved but Please clarify what you mean by "internal switch" in the server. Does the server come with a built in ethernet switch? I have never come across such a thing. It would be great if you could give the hardware details about your server e.g. brand/model of motherboard and the installed cards. -- Arun Khan ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
Hi friends, I found that there is an internal switch in 192.168.48.9 server system. The problem is with the port in internal switch. I changed the port and now everything is fine. Thanks to all who spent time to clear me. Thanks again. -- with regards Raja Pandi ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
2010/10/9 ராஜ பாண்டி : >> Try arping, at least to see, whether you are getting the ARP reply or not. > > > The same response for arping also. For arping 110 got ARP replies and > 109 didnot from 192.168.48.9 . Can you borrow a switch and repeat the tests and share your results? -- Arun Khan ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
> Try arping, at least to see, whether you are getting the ARP reply or not. The same response for arping also. For arping 110 got ARP replies and 109 didnot from 192.168.48.9 . -- with regards Raja Pandi ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
> Check on 192.168.48.9 to see if it can see the ARP packets. I ping 192.168.48.9 from both 109 and 110 and i captured the packets at server using tcpdump. When i opened it using wireshark it shows the ping request from 110 and ping reply to 110, but nothing for 109. When i saw ARP packets it shows, No. TimeSourceDestinationProtocol Info 9 2.997091HewlettP_c2:83:fe 00:24:01:a3:0f:fc ARP Who has 192.168.48.110? Tell 192.168.48.9 102997174 00:24:01:a3:0f:fc HewlettP_c2:83:fe ARP 192.168.48.110 is at 00:24:01:a3:0f:fc During ping command execution 110 "pings" and at 109 "destination host unreachable" . -- with regards Raja Pandi ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
On Sat, Oct 9, 2010 at 12:05 PM, Abhishek K wrote: Try arping, at least to see, whether you are getting the ARP reply or not. -- Bharathi Subramanian ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
Hi, On Friday 08 October 2010 06:15 PM, ராஜ பாண்டி wrote: Whats the output of wireshark for ping packets? While ping only i got this as ouput I think you you forgot the attachment/output :) Abhishek ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
On 10/08/2010 05:36 PM, ராஜ பாண்டி wrote: > While pinging, ARP packets are sent as broadcast transmission. > > The output of wireshark is like > >" 3.01 00:24:01:a3:99:4b Broadcast ARP Who has > 192.168.48.9? Tell 192.168.48.109 " > > It's taken from 192.168.48.109 system. Check on 192.168.48.9 to see if it can see the ARP packets. -- .o. I'm a Free man. I use Free Software. ..o ooo http://www.joesteeve.org/ signature.asc Description: OpenPGP digital signature ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
> Whats the > output of wireshark for ping packets? While ping only i got this as ouput -- with regards Raja Pandi ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
Hi, On Friday 08 October 2010 05:36 PM, ??? ?? wrote: > While pinging, ARP packets are sent as broadcast transmission. > > The output of wireshark is like > >" 3.01 00:24:01:a3:99:4b Broadcast ARP Who has > 192.168.48.9? Tell 192.168.48.109 " > > It's taken from 192.168.48.109 system. ARP packets when requesting for mac is always broadcast. Whats the output of wireshark for ping packets? Abhishek ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
While pinging, ARP packets are sent as broadcast transmission. The output of wireshark is like " 3.01 00:24:01:a3:99:4b Broadcast ARP Who has 192.168.48.9? Tell 192.168.48.109 " It's taken from 192.168.48.109 system. -- with regards Raja Pandi ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
On Thu, Oct 7, 2010 at 2:02 PM, Joe Steeve wrote: > On 10/06/2010 11:54 PM, Arun Khan wrote: >> I am presuming the "server" is 192.168.48.9 since you have not >> explicitly stated so. What is your objective for using a /28 netmask? >> >> Anyway, with a /28 netmask, the "server" is on a different subnet >> vis-a-vis your other systems. see [1] and [2] > > The OP is using /20 netmask. The IP numbers are correct. The problem is > elsewhere. Mehul pointed it out in his own style; I accepted my error and also pointed to a possible cause and a solution. -- Arun Khan ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
On Thu, Oct 7, 2010 at 4:32 PM, Joe Steeve wrote: > The OP is using /20 netmask. The IP numbers are correct. The problem is > elsewhere. Long back, I faced a similar problem due to the failure of the switch internal buffer, which used to store the MAC table. Bye :) -- Bharathi Subramanian ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
On 10/06/2010 11:54 PM, Arun Khan wrote: > I am presuming the "server" is 192.168.48.9 since you have not > explicitly stated so. What is your objective for using a /28 netmask? > > Anyway, with a /28 netmask, the "server" is on a different subnet > vis-a-vis your other systems. see [1] and [2] The OP is using /20 netmask. The IP numbers are correct. The problem is elsewhere. j...@lark:~$ sipcalc 192.168.48.9 255.255.240.0 -[ipv4 : 192.168.48.9 255.255.240.0] - 0 [CIDR] Host address- 192.168.48.9 Host address (decimal) - 3232247817 Host address (hex) - C0A83009 Network address - 192.168.48.0 Network mask- 255.255.240.0 Network mask (bits) - 20 Network mask (hex) - F000 Broadcast address - 192.168.63.255 Cisco wildcard - 0.0.15.255 Addresses in network- 4096 Network range - 192.168.48.0 - 192.168.63.255 Usable range- 192.168.48.1 - 192.168.63.254 -- .o. I'm a Free man. I use Free Software. ..o ooo http://www.joesteeve.org/ signature.asc Description: OpenPGP digital signature ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
On Wed, Oct 6, 2010 at 11:59 PM, Mehul Ved wrote: > On Wed, Oct 6, 2010 at 11:54 PM, Arun Khan wrote: >> 2010/10/6 ராஜ பாண்டி : > >>> Netmask is 255.255.240.0 . > >> [1] $ sipcalc 192.168.48.9 255.255.255.240 > > Both netmasks are different. > Mea Culpa. Most likely the OP has a bad switch; time for a replacement - go for a name brand like DLink or Linksys. -- Arun Khan ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
On Wed, Oct 6, 2010 at 11:54 PM, Arun Khan wrote: > 2010/10/6 ராஜ பாண்டி : >> Netmask is 255.255.240.0 . > [1] $ sipcalc 192.168.48.9 255.255.255.240 Both netmasks are different. -- With Regards, Mehul Ved ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
2010/10/6 ராஜ பாண்டி : > > I am having a switch ,one server and 3 systems which are connected to > the switch. The IPs are 192.168.48.9, 108,109,110 respectively. > Netmask is 255.255.240.0 . I am presuming the "server" is 192.168.48.9 since you have not explicitly stated so. What is your objective for using a /28 netmask? Anyway, with a /28 netmask, the "server" is on a different subnet vis-a-vis your other systems. see [1] and [2] > Now there is no problem in ping command > among 108,109,110 always. But i can ping the server from only one > system either 108 or 109 or 110. Given you are using a /28 netmask this is interesting ... even though the 2 subnets are on the same physical fabric, you would need some kind of routing to occur for ping to work between hosts on the 2 subnets. > If 192.168.48.109 pings the server, > 108,110 did not ping the server. After some interval 192.168.48.110 > pings and 192.168.48.109,108 did not ping the server. I also checked > the cables. They are all right. What is the problem in network > connection? Can someone bring me out? IMO, the netmask is your problem. With a /24 netmask all the machines should be able to ping each other. (make sure iptables and SE Linux are disabled) Buy a new switch if the problem still persists. [1] $ sipcalc 192.168.48.9 255.255.255.240 -[ipv4 : 192.168.48.9 255.255.255.240] - 0 [CIDR] Host address- 192.168.48.9 Host address (decimal) - 3232247817 Host address (hex) - C0A83009 Network address - 192.168.48.0 Network mask- 255.255.255.240 Network mask (bits) - 28 Network mask (hex) - FFF0 Broadcast address - 192.168.48.15 Cisco wildcard - 0.0.0.15 Addresses in network- 16 Network range - 192.168.48.0 - 192.168.48.15 Usable range- 192.168.48.1 - 192.168.48.14 [2] $ sipcalc 192.168.48.108 255.255.255.240 -[ipv4 : 192.168.48.108 255.255.255.240] - 0 [CIDR] Host address- 192.168.48.108 Host address (decimal)- 3232247916 Host address (hex)- C0A8306C Network address- 192.168.48.96 Network mask- 255.255.255.240 Network mask (bits)- 28 Network mask (hex)- FFF0 Broadcast address- 192.168.48.111 Cisco wildcard- 0.0.0.15 Addresses in network- 16 Network range- 192.168.48.96 - 192.168.48.111 Usable range- 192.168.48.97 - 192.168.48.110 -- Arun Khan ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
2010/10/6 ராஜ பாண்டி > > Managed or unmanaged? > > It's an unmanagable (unprogrammable) switch only. > If its an unmanageable switch, try checking the tcpdump output and see if you are receiving any ping packets on the server. similarly, check on the systems if the packets are being sent consistently or not. If both are fine, then try to check on another similar switch if you have one. also, you can try different ports on the same switch. Might help. Regards, Abhi > > -- > with regards > Raja Pandi > ___ > ILUGC Mailing List: > http://www.ae.iitm.ac.in/mailman/listinfo/ilugc > ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
> Managed or unmanaged? It's an unmanagable (unprogrammable) switch only. -- with regards Raja Pandi ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
Re: [Ilugc] Can not ping via switch consistently
2010/10/6 ராஜ பாண்டி : > Hi, > > I am having a switch ,one server and 3 systems which are connected to > the switch. The IPs are 192.168.48.9, 108,109,110 respectively. > Netmask is 255.255.240.0 . Now there is no problem in ping command > among 108,109,110 always. But i can ping the server from only one > system either 108 or 109 or 110. If 192.168.48.109 pings the server, > 108,110 did not ping the server. After some interval 192.168.48.110 > pings and 192.168.48.109,108 did not ping the server. I also checked > the cables. They are all right. What is the problem in network > connection? Can someone bring me out? > Managed or unmanaged? -Girish -- Gayatri Hitech http://gayatri-hitech.com gir...@gayatri-hitech.com ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
[Ilugc] Can not ping via switch consistently
Hi, I am having a switch ,one server and 3 systems which are connected to the switch. The IPs are 192.168.48.9, 108,109,110 respectively. Netmask is 255.255.240.0 . Now there is no problem in ping command among 108,109,110 always. But i can ping the server from only one system either 108 or 109 or 110. If 192.168.48.109 pings the server, 108,110 did not ping the server. After some interval 192.168.48.110 pings and 192.168.48.109,108 did not ping the server. I also checked the cables. They are all right. What is the problem in network connection? Can someone bring me out? -- with regards Raja Pandi ___ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
