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Ping between Two VLAN's

Posted on 2012-08-28
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Last Modified: 2012-09-10
Hello All,

In our network we have 2 VLAN's (vlan-41 and Vlan-42). i connected a laptop LAN to Vlan-41 and Wifi to Vlan-42. when i try to ping/access wifi (vlan-42 IP) i am unable to access but, i can able to access LAN (vlan-41 IP).

both VLAN's are working normal.

can any body help me to resolve the issue. i need to make this work in our office.


Thanks in Advance
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Question by:hellosoft
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Expert Comment

by:lesliem-sa
ID: 38340210
Hi,

a few questions:
is other lan traffic between vlan-41 and vlan-42 working correctly?  Can you ping the AP ip address on vlan-42 from a host on vlan-41?
what device is routing traffic between the vlans?  Are both vlans allowed over the trunk?
how is the port configured where the ap plugs into the switch?
are you using more than 1 switch in your network?
Is your AP configured to tag packets?

Regards,
Leslie
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Author Comment

by:hellosoft
ID: 38340549
Hello Leslie,

First Thanks for your quick response.

1) Traffic between Vlan-41 and Vlan-42 is fine.
2) Can able to ping from vlan-41 to AP on vlan-42.
3) using Hp pro-curve switch for routing between vlan-41 and vlan-42.
4)yes, both vlan's are allowed over trunk
5)Yes, we are using more number of switches.
6) there is not specific configuration of ports for AP.
7)AP is configured with basic settings.

Thanks,
Rafi
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Expert Comment

by:lesliem-sa
ID: 38340658
OK, just to be clear - you are trying to ensure that all wireless clients connected to teh AP are on Vlan-42?
If there is no vlan configuration in the AP itself, then you need to add the port that the AP connect to to the vlan-42 vlan - set it as "untagged"  This will put the AP itself in the vlan-42 vlan - check that it is on the correct network, and also check that the AP clients are getting the correct ip addresses for the vlan-42 vlan.
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Author Comment

by:hellosoft
ID: 38340711
ok i got it.

AP connected to vlan-42 (port is untagged to vlan-42).

the idea is :
i got laptop 1 interface to vlan-41 and one interface to vlan-42. i can able to ping vlan-41 interface from machine in vlan-41 network and vlan-42 interface from machine in vlan-42 network. but not able to ping vlan-41 interface from machine in vlan-42 network.. vice ..versa.

(but routing is working between vlan-41 and vlan-42 traditionally)


Cheers,
Rafi
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Expert Comment

by:lesliem-sa
ID: 38344235
Hi Rafi,

If other hosts are able to ping each other across the two clans, then it could be a firewall on the laptop that is blocking the pings?
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Author Comment

by:hellosoft
ID: 38344265
yes,

other hosts can ping each other (vlan41 to vlan42 and vice versa).
vlan-42 hosts can ping vlan-42 ip of laptop, vlan-41 hosts can ping vlan-41 ip of laptop.

firewall is already disabled in laptop...

Any ideas Please
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Expert Comment

by:lesliem-sa
ID: 38344344
Would you try ping the laptop vlan-41 interface from a host on vlan-42 and then run "arp -a" to see what mac address is being resolved for the laptop vlan-41 interface please?
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Expert Comment

by:lesliem-sa
ID: 38344360
Also, please do a trace route to the laptop vlan-41 interface from a host on vlan-42.
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Author Comment

by:hellosoft
ID: 38344902
Hi,

Actually with another laptop with windows i can able to ping to both vlan's. but, with linux OS it's not working.

Thanks
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Expert Comment

by:lesliem-sa
ID: 38344924
are you doing any vlan tagging within the linux network stack?
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Author Comment

by:hellosoft
ID: 38344940
Nope!!

same for both windows and Linux.
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Accepted Solution

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lesliem-sa earned 2000 total points
ID: 38344955
I should have asked this long ago, but:
Why are you trying to ping from vlan-41 to the interface in vlan-42 when the host already has an interface in vlan-41.  What are you trying to achieve.

It is possible, that this is by design in linux - according to its routing table, to reach the vlan-41 subnet (originating IP) is sends the return packet via its vlan-41 interface instead of using the interface that it received the icmp packet on originally (vlan-42) ?
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Author Comment

by:hellosoft
ID: 38345207
Hi,

Actually ping is required for testing VoIP related stuff by our testing teams.

i didn't understand second half could you please elaborate..
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