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Pinging pc by name won't resolve right away. IP address does when laptop is not on domain.

Posted on 2015-01-15
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Last Modified: 2015-01-15
Users from our domain take their laptops off premise and connect with a router (wifi) in a conference room in order to share their files and software. Today it seems there is some lag and even drops in their connections. There is no WAN connection where they are. the router gives out DHCP addresses. The issue i am noticing is that if i try to ping a PC on this conference room lan by its name it will stall for 20 seconds or so, then reply (from the IPv4 address). if i ping by ip address it replies right away. I am not sure if this was always the case but nothing that i know of has changed on our setup. (happens with different routers and PC's)

i assume it has to do with DNS and the fact that the Domain usually has the DNS info for them. Was looking at MasterBrowser but don't think it will do anything since the computers are technically joined to the domain and they log in with their domain account while they are out in the field.

Please help me understand if this is normal behavior or how to get around it.
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Question by:x_phone_tech
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8 Comments
 
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Expert Comment

by:Will Szymkowski
ID: 40552589
Have you done an ipconfig /flushdns on your machine, then try pinging by name again? What happens if you ping the machine but the FQDN rather than the NetBIOS name?

Will.
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Author Comment

by:x_phone_tech
ID: 40552601
Will - yes, flush didn't make a difference. pinging by fqdn completely fails.
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Expert Comment

by:Will Szymkowski
ID: 40552612
Does this happen if you ping the machine from a different laptop on the network? If it works from a different machine on the network I would check your DNS Suffix on the network adapter for your laptop.

When you say ping the machine using the FQDN fails completely means there is something wrong with your DNS. depending on the network simply ping the machine by NetBIOS name will take longer to reply back using NetBIOS/TCP/IP.

Are you using Active Directory Integrated DNS? Can you check your DNS Zones to ensure that they are present and the machines are actually registered in there?

Will.
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Author Comment

by:x_phone_tech
ID: 40552635
While the machines are on the domain network pinging is fine. it is only when the users leave the building and go off-site where they setup their own little LAN with a router. right now i have 4 pc's all off the domain on a conference room table with their own lan setup. No DNS server just 4 laptops and a router with DHCP. the pc's ping by ip address great. but when you ping by computer name it stalls for 15 to 20 seconds before replying which is causing the network shares / mapped drives to each other to lag.
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Will Szymkowski earned 500 total points
ID: 40552642
Ok well that is your answer. If you have a few machines off of the domain connected to a little switch without a DNS server when you ping by name you are using NetBIOS over TCP/IP. This process takes some time to initiate and will only reply back if the network adapter is setup for NetBIOS over tcp/ip.

When you ping via IP it is much faster because there is no lookup involved and it is at the network layer.

This is by design.

Below is some more info regarding NetBIOS over TCP/IP and WINS.
netbios over tcp/ip WINS

Will.
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Author Comment

by:x_phone_tech
ID: 40552655
That is what i figured. so do you see anyway to make this able to work? an extra device or netbios settings that can speed it up?  Host table but then i would need to have all routers they take with them set for ip address reservations and also on the domain i suppose?
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Expert Comment

by:Will Szymkowski
ID: 40552661
If this off-domain meetings are not happening all of the time what is the importance to be able to ping by name  if there is only 4 machines connected to a switch.

You could update the host file on all of the machine to add the IP and NetBIOS name of each machine. This then gets messy because when the machines go back on the domain and they get a new IP from DHCP the users that have those settings in their host file will continue to ping the NetBIOS name of those machines and it will reply back with the incorrect IP.

This host file thing is just something that can speed up the ping process but I personally wouldn't use it because there is too much work involved managing it.

Will.
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Author Comment

by:x_phone_tech
ID: 40552770
the main concern is that one of them will host the software they all connect to which is using a small sql database. the "host" can be any one of the people in the groups. so i "think" this is what is slowing the connection between the computers because the software is connected via machine names...

Thanks for your help. It proves to me then that this is the way it has been for years and their issues they had out of the office today were probably not caused by this but something else.
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