| Author |
Message |
lauren@laurenchild.net
Guest
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 Posted:
Tue Oct 25, 2005 12:50 pm Post subject:
Reverse IP to name lookups and netbios |
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Hi,
I have a box doing reverse IP lookups, and I dont know how.
We have no reverse DNS set up.
We have no WINS/NBNS server set up.
Nothing in LMHOSTS.
Despite this it is reverse resolving the IP address (that it knows) to
the Netbios/NBT name (that it shouldnt know).
The devices are on routed subnets so are not within the broadcast
domain for normal Netbios/NBT.
If the normal reverse lookup methods fail, does the windows resolver
unicast to the box and lookup the name ala nbtstat?
Thanks,
Lauren |
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totoiste
Guest
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| Posted:
Tue Oct 25, 2005 12:50 pm Post subject:
Re: Reverse IP to name lookups and netbios |
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Do you know your NetBt Node Type ? (ipconfig /all)
It gives you your search order for Netbios (Broadcast, WINS)...
What is the result of 'nbtstat -c' ? (Show the local cache of Netbios
Name resolution)
If no reverse DNS, no WINS, the only way that your box has to resolve
is Broadcast... |
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lauren@laurenchild.net
Guest
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| Posted:
Tue Oct 25, 2005 4:50 pm Post subject:
Re: Reverse IP to name lookups and netbios |
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The node type is Hybrid. The cache shows one machine, but the lookups
happen rarely. |
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Doug Sherman [MVP]
Guest
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| Posted:
Wed Oct 26, 2005 12:50 am Post subject:
Re: Reverse IP to name lookups and netbios |
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NetBT can issue a NetBIOS adapter status request (also called a NetBIOS node
status request) to the destination IP address, and then parse the returned
name table for the name registered by the server service
(<computername>[0x20]) - eg nbtstat -a IPaddress.
This will also work with Windows sockets applications through the
gethostbyaddr() call using the following sequence:
1.Check local computer host name.
2.Check the HOSTS file for a matching address entry.
3.If a DNS server is configured, query it.
4.If no match is found, send a NetBIOS Adapter Status Request to the IP
address being queried, and if it responds with a list of NetBIOS names
registered for the adapter, parse it for the computer name.
Doug Sherman
MCSE, MCSA, MCP+I, MVP
<lauren@laurenchild.net> wrote in message
news:1130236549.828763.192670@z14g2000cwz.googlegroups.com...
| Quote: | Hi,
I have a box doing reverse IP lookups, and I dont know how.
We have no reverse DNS set up.
We have no WINS/NBNS server set up.
Nothing in LMHOSTS.
Despite this it is reverse resolving the IP address (that it knows) to
the Netbios/NBT name (that it shouldnt know).
The devices are on routed subnets so are not within the broadcast
domain for normal Netbios/NBT.
If the normal reverse lookup methods fail, does the windows resolver
unicast to the box and lookup the name ala nbtstat?
Thanks,
Lauren
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