Re: how to change isc-dhcp3-server replies? (was:

Joe Sat, 01 Sep 2007 18:49:07 -0700

isc-dhcp3-server issues with windows 2000 client) 
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Ok, no so true.  I am watching tcpdump output from the two binaries. The old 
binary sends its reply to 255.255.255.255, while the new one sends its reply to 
192.168.0.15.  Same config file and I tried the always-broadcast flag, and it 
only sets the bit for the client, but the server still broadcasts its reply to 
the client on the subnet mask.  

Old client reply (ml.. is server af is client):  

1188694380.961642 ml:ml:ml:ml:ml:ml > ff:ff:ff:ff:ff:ff, ethertype IPv4 
(0x0800), length 342: (tos 0x10, ttl  16, id 0, offset 0, flags [none], proto: 
UDP (17), length: 328) 192.168.0.15.67 > 255.255.255.255.68: BOOTP/DHCP, Reply, 
length: 300, xid:0x77915dc3, flags: [Broadcast] (0x8000)
          Your IP: 192.168.0.13
          Client Ethernet Address: af:af:af:af:af:af [|bootp]

new client does not do this and clients do not get their ip address. I read 
somewhere that linux had a problem doing this in 2.2 kernels and it has 
something to do with the routing table in linux.  Not sure what is going on 
here, but the routing table looks fine.  

Joe

[EMAIL PROTECTED] wrote:









> > It seems that the dhcpd server is replying to the subnet and not the
> > broadcast net.  So the reply that should be sent to 255.255.255.255:68 is
> > sent to 192.168.0.255:68.  Then, because the client has no IP address or
> > has defaulted it to a 169.x.x.x(MS defaults) it does not seem to be
> > getting the reply and thus never gets an address assigned.
>
It is for DHCPDISCOVER, since there is no subnet yet:
# dhclient -d fxp0
DHCPDISCOVER on fxp0 to 255.255.255.255 port 67 interval 4

As for the option you're looking for, man dhcpd.conf showed me this:
         always-broadcast flag;








       
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Ok, no so true.&nbsp; I am watching tcpdump output from the two binaries. The 
old binary sends its reply to 255.255.255.255, while the new one sends its 
reply to 192.168.0.15.&nbsp; Same config file and I tried the always-broadcast 
flag, and it only sets the bit for the client, but the server still broadcasts 
its reply to the client on the subnet mask.&nbsp; <br><br>Old client reply 
(ml.. is server af is client):&nbsp; <br><br>1188694380.961642 
ml:ml:ml:ml:ml:ml &gt; ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: 
(tos 0x10, ttl&nbsp; 16, id 0, offset 0, flags [none], proto: UDP (17), length: 
328) 192.168.0.15.67 &gt; 255.255.255.255.68: BOOTP/DHCP, Reply, length: 300, 
xid:0x77915dc3, flags: [Broadcast] 
(0x8000)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Your IP: 
192.168.0.13<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Client 
Ethernet Address: af:af:af:af:af:af [|bootp]<br><br>new client does not do this 
and clients do not get their ip
 address. I read somewhere that linux had a problem doing this in 2.2 kernels 
and it has something to do with the routing table in linux.&nbsp; Not sure what 
is going on here, but the routing table looks fine.&nbsp; 
<br><br>Joe<br><br><b><i>[EMAIL PROTECTED]</i></b> wrote:<blockquote 
class="replbq" style="border-left: 2px solid rgb(16, 16, 255); margin-left: 
5px; padding-left:
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PROTECTED]><freebsd-questions@freebsd.org><[EMAIL PROTECTED]><[EMAIL 
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org><[EMAIL PROTECTED]><[EMAIL PROTECTED]><[EMAIL PROTECTED]><[EMAIL 
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PROTECTED]><freebsd-questions@freebsd.org><[EMAIL PROTECTED]><[EMAIL 
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PROTECTED]><[EMAIL PROTECTED]><[EMAIL PROTECTED]><[EMAIL PROTECTED]><[EMAIL 
PROTECTED]><[EMAIL PROTECTED]><[EMAIL 
PROTECTED]><freebsd-questions@freebsd.org><[EMAIL PROTECTED]>&gt; &gt; It seems 
that the dhcpd server is
 replying to the subnet and not the<br>&gt; &gt; broadcast net.  So the reply 
that should be sent to 255.255.255.255:68 is<br>&gt; &gt; sent to 
192.168.0.255:68.  Then, because the client has no IP address or<br>&gt; &gt; 
has defaulted it to a 169.x.x.x(MS defaults) it does not seem to be<br>&gt; 
&gt; getting the reply and thus never gets an address assigned.<br>&gt;<br>It 
is for DHCPDISCOVER, since there is no subnet yet:<br># dhclient -d 
fxp0<br>DHCPDISCOVER on fxp0 to 255.255.255.255 port 67 interval 4<br><br>As 
for the option you're looking for, man dhcpd.conf showed me this:<br>         
always-broadcast
 flag;<br></[EMAIL PROTECTED]></freebsd-questions@freebsd.org></[EMAIL 
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om></[EMAIL PROTECTED]></blockquote><br><p>&#32;
      <hr size=1>Moody friends. Drama queens. Your life? Nope! - their life, 
your story.<br> <a 
href="http://us.rd.yahoo.com/evt=48224/*http://sims.yahoo.com/";>Play Sims 
Stories at Yahoo! Games. </a>
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