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BOOTP htype, len,... for dial - up ISP

Posted on 2001-08-24
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Last Modified: 2010-10-05
Hi,
My dial-up ISP uses DHCP for my configuration.
There are a few fields that I'm not sure of how to fill for my modem.
htype - hardware type
hlen

Is it 20, serial line?

1 Ethernet (10Mb)                                    
2 Experimental Ethernet (3Mb)                        
3 Amateur Radio AX.25                                
4 Proteon ProNET Token Ring                          
5 Chaos                                              
6 IEEE 802 Networks                                  
7 ARCNET                                            
8 Hyperchannel                                      
9 Lanstar                                            
10 Autonet Short Address                            
11 LocalTalk                                        
12 LocalNet (IBM PCNet or SYTEK LocalNET)            
13 Ultra link                                        
14 SMDS                                            
15 Frame Relay                                        
16 Asynchronous Transmission Mode (ATM)              
17 HDLC                                              
18 Fibre Channel                      
19 Asynchronous Transmission Mode (ATM)      
20 Serial Line                                        
21 Asynchronous Transmission Mode (ATM)              

Thanks

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Question by:bod_1
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by:SysExpert
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Yes - Modem is serial line.

I hope this helps !
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by:SysExpert
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Usually - Dial up uses PPP and des not require any configuration.
Are you sure he is using DHCP ??

I hope this helps !
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by:bod_1
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Thanks SysExpert,

Yup.  They have an install disk and it sets, control panel -> networking -> 'use DHCP for WINS resolution' radio button.
I didn't think that PPP had any gateway, nameserver, or address configuration stuff.  If not, wouldn't DHCP be sort of a mandatory step in configuring TCP and IP modules for dial-in servers?

Can you answer two more quick questions? I'll add points to this one;

The Bootstrap protocol states ports 67 and 68 are bootp server and client respectively. I couldn't find port numbers in the DHCP rfcs. Since DHCP is an extension of bootp, am I right to assume that these same ports are used?

and

what is WINS resolution? (I know it's got to have something to do with nameservers.)

Thanks

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SysExpert earned 100 total points
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First of all, in the dial-up networking, there is an advanced option per connection,  that lets you say what the ppp Server is going to be, and the DNS etc ( ie, whether to use the ISP's PPP defaults- similar to DHCP ).

WINS is NetBIOS resolution for Microsoft machines - Netbios name to IP  etc. This should really not matter to an ISP.

here are some sites to let you know about different ports, and the common usage
                 http://www.robertgraham.com/pubs/firewall-seen.html
                 http://www.isi.edu/in-notes/iana/assignments/port-numbers
                 http://www.netice.com/advice/Exploits/Ports/ <note this site

List of TCp/IP ports ports list, port list TCP ports list                 http://www.joemagee.com/filez/port-numbers.txt

I hope this helps !
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by:bod_1
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Thanks SysExpert,
The pages are answering a lot of questions I had.
Cheers
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