<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>On Jan 7, 2013, at 8:02 PM, Yaroslav Molochko wrote:</div><div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr">I have simple configuration of the DHCP server. <div style=""></div><div style=""></div></div></blockquote><div><br></div><div>[cut]</div><br><blockquote type="cite"><div dir="ltr"><div style=""><div style="">Then I configure Dlink DES-3200 series switch to be my DHCP Relay. And here is what I see in tcpdump output:</div>
<div style="">====</div><div style=""><div> 10.75.0.146.68 > 10.75.0.252.67: [udp sum ok] BOOTP/DHCP, Request from 8c:89:a5:13:bf:f0, length 324, hops 1, xid 0x50c40ccf, secs 3328, Flags [none] (0x0000)</div><div></div></div></div></div></blockquote><div><br></div><div>[cut]</div><br><blockquote type="cite"><div dir="ltr"><div style=""><div style=""><div style="">and here DHCP server rejects requests:</div><div style="">====</div><div style="">05:42:26.633369 IP (tos 0xc0, ttl 64, id 30699, offset 0, flags [none], proto ICMP (1), length 380)<br>
</div><div> 10.75.0.252 > <a href="http://10.75.0.146/">10.75.0.146</a>: ICMP 10.75.0.252 udp port 67 unreachable, length 360</div><div><span class="" style="white-space:pre"> </span>IP (tos 0x0, ttl 128, id 16204, offset 0, flags [none], proto UDP (17), length 352)</div>
<div>====</div><div><br></div><div style="">I've checked out my firewall:</div><div style="">====</div><div style=""><div> iptables -nvL</div><div>Chain INPUT (policy ACCEPT 395 packets, 35787 bytes)</div><div> pkts bytes target prot opt in out source destination </div>
</div></div></div></div></blockquote><br></div><div><div>Is the server listening on UDP port 67?</div><br><div></div></div>If this is Linux, you can probably find out with this command (as root):<div><br></div><div>lsof -i:67</div><div><br></div><div>If not, is dhcpd running at all? Again, for Linux:</div><div><br></div><div>ps ax | grep dhcpd | grep -v grep</div><div><br></div><div>Chris Buxton</div><div>BlueCat Networks</div></body></html>