Date: Thu, 27 Dec 2001 10:52:27 -0000 From: "G D McKee" <freebsd@gdmckee.com> To: "Stefan de Zeeuw" <stefan.de.zeeuw@wellance.com>, "Freebsd-Questions@Freebsd. Org (E-mail)" <freebsd-questions@freebsd.org> Subject: Re: Weird IP problem! Message-ID: <000d01c18ec4$933542c0$0a00a8c0@p1000> References: <0107A170FEECD211ABE500104BD665BBFF020C@monster.wellance.com>
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[-- Attachment #1 --] Weird IP problem!Hi Don't know about your cable modem but it sounds like it does the same as mine. They have a build in DHCP server and your PC will grab an address from the cable modem itself if it can't find a DHCP server up-stream. You can test the theory by removing the lead from the back of the cable modem and restarting dhclient!!!!! Gordon ----- Original Message ----- From: Stefan de Zeeuw To: Freebsd-Questions@Freebsd. Org (E-mail) Sent: Thursday, December 27, 2001 10:37 AM Subject: Weird IP problem! My setup: FreeBSD4.4-RELEASE connected to a cablemodem via rl0 rl1 is connected to a HUB and 2 clients And the machine acts as a firewall/NAT config Yesterday my internet connection was dead, the cablemodem was acting strange(the lights) and I did a power recycle on the modem, nothing happend, same results. After that I found this in my log: Dec 25 17:07:37 FIREWALL /kernel: arp: unknown hardware address format (0x0800) Dec 26 03:01:44 FIREWALL natd[284]: failed to write packet back (No route to host) Dec 26 03:02:54 FIREWALL natd[284]: failed to write packet back (No route to host) Dec 26 03:04:14 FIREWALL last message repeated 2 times Dec 26 03:14:56 FIREWALL last message repeated 14 times Dec 26 03:19:10 FIREWALL last message repeated 13 times Dec 26 05:15:02 FIREWALL natd[284]: failed to write packet back (No route to host) <snip> Dec 26 09:23:25 FIREWALL /kernel: arplookup 192.168.100.1 failed: host is not on local network Dec 26 09:47:33 FIREWALL /kernel: arplookup 192.168.100.1 failed: host is not on local network Dec 26 09:50:16 FIREWALL dhclient: New IP Address(rl0): 192.168.100.11 Dec 26 09:50:16 FIREWALL dhclient: New Subnet Mask (rl0): 255.255.255.0 Dec 26 09:50:16 FIREWALL dhclient: New Broadcast Address(rl0): 192.168.100.255 Dec 26 10:23:49 FIREWALL natd[284]: failed to write packet back (No route to host) Dec 26 10:23:51 FIREWALL natd[284]: failed to write packet back (No route to host) Dec 26 10:23:51 FIREWALL dhclient: New IP Address(rl0): 192.168.100.11 Dec 26 10:23:51 FIREWALL dhclient: New Subnet Mask (rl0): 255.255.255.0 Dec 26 10:23:51 FIREWALL dhclient: New Broadcast Address(rl0): 192.168.100.255 Dec 26 10:24:43 FIREWALL natd[284]: failed to write packet back (No route to host) Dec 26 10:24:51 FIREWALL natd[284]: failed to write packet back (No route to host) Dec 26 10:24:52 FIREWALL dhclient: New IP Address(rl0): 192.168.100.11 Dec 26 10:24:52 FIREWALL dhclient: New Subnet Mask (rl0): 255.255.255.0 Dec 26 10:24:52 FIREWALL dhclient: New Broadcast Address(rl0): 192.168.100.255 Dec 26 10:26:40 FIREWALL natd[284]: failed to write packet back (No route to host) Dec 26 10:26:43 FIREWALL natd[284]: failed to write packet back (No route to host) Dec 26 10:26:43 FIREWALL dhclient: New IP Address(rl0): 192.168.100.11 Dec 26 10:26:43 FIREWALL dhclient: New Subnet Mask (rl0): 255.255.255.0 Dec 26 10:26:43 FIREWALL dhclient: New Broadcast Address(rl0): 192.168.100.255 Dec 26 10:39:01 FIREWALL /kernel: arp: 00:20:40:e3:1d:7b is using my IP address 0.0.0.0! Dec 26 10:39:01 FIREWALL last message repeated 51 times Dec 26 11:37:59 FIREWALL /kernel: arp: 00:20:40:e3:1d:7b is using my IP address 0.0.0.0! Dec 26 11:37:59 FIREWALL last message repeated 256 times Dec 26 11:52:13 FIREWALL natd[284]: failed to write packet back (No route to host) Dec 26 12:20:47 FIREWALL login: ROOT LOGIN (root) ON ttyv0 Dec 26 12:24:02 FIREWALL natd[284]: failed to write packet back (No route to host) Dec 26 12:24:02 FIREWALL last message repeated 64 times Dec 26 12:26:18 FIREWALL last message repeated 5 times Dec 26 12:26:18 FIREWALL dhclient: New IP Address(rl0): 213.73.160.xxx Dec 26 12:26:18 FIREWALL dhclient: New Subnet Mask (rl0): 255.255.255.0 Dec 26 12:26:18 FIREWALL dhclient: New Broadcast Address(rl0): 213.73.160.255 Dec 26 12:26:18 FIREWALL dhclient: New Routers: 213.73.160.1 It is very strange and i do not understand what may have happend here. Was it a error by my ISP or was it a intrusion attempt? After this i killed my dhclient and started it up again, assigning me my original ip address. And everything was fine. But I would like to know what happend here. Anyone have some ideas?? I would like to hear them! Sincerly Stef [-- Attachment #2 --] <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD><TITLE>Weird IP problem!</TITLE> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.2712.300" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Hi</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Don't know about your cable modem but it sounds like it does the same as mine. They have a build in DHCP server and your PC will grab an address from the cable modem itself if it can't find a DHCP server up-stream. You can test the theory by removing the lead from the back of the cable modem and restarting dhclient!!!!!</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Gordon</FONT></DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=stefan.de.zeeuw@wellance.com href="mailto:stefan.de.zeeuw@wellance.com">Stefan de Zeeuw</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=freebsd-questions@freebsd.org href="mailto:Freebsd-Questions@Freebsd. Org (E-mail)">Freebsd-Questions@Freebsd. Org (E-mail)</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, December 27, 2001 10:37 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Weird IP problem!</DIV> <DIV><BR></DIV><BR> <P><FONT size=2>My setup:</FONT> <BR><FONT size=2>FreeBSD4.4-RELEASE connected to a cablemodem via rl0</FONT> <BR><FONT size=2>rl1 is connected to a HUB and 2 clients</FONT> <BR><FONT size=2>And the machine acts as a firewall/NAT config</FONT> </P> <P><FONT size=2>Yesterday my internet connection was dead, the cablemodem was acting strange(the lights) and I did a power recycle on the modem, nothing happend, same results.</FONT></P> <P><FONT size=2>After that I found this in my log:</FONT> </P> <P><FONT size=2>Dec 25 17:07:37 FIREWALL /kernel: arp: unknown hardware address format (0x0800)</FONT> <BR><FONT size=2>Dec 26 03:01:44 FIREWALL natd[284]: failed to write packet back (No route to host)</FONT> <BR><FONT size=2>Dec 26 03:02:54 FIREWALL natd[284]: failed to write packet back (No route to host)</FONT> <BR><FONT size=2>Dec 26 03:04:14 FIREWALL last message repeated 2 times</FONT> <BR><FONT size=2>Dec 26 03:14:56 FIREWALL last message repeated 14 times</FONT> <BR><FONT size=2>Dec 26 03:19:10 FIREWALL last message repeated 13 times</FONT> <BR><FONT size=2>Dec 26 05:15:02 FIREWALL natd[284]: failed to write packet back (No route to host)</FONT> <BR><FONT size=2><snip></FONT> <BR><FONT size=2>Dec 26 09:23:25 FIREWALL /kernel: arplookup 192.168.100.1 failed: host is not on local network</FONT> <BR><FONT size=2>Dec 26 09:47:33 FIREWALL /kernel: arplookup 192.168.100.1 failed: host is not on local network</FONT> <BR><FONT size=2>Dec 26 09:50:16 FIREWALL dhclient: New IP Address(rl0): 192.168.100.11</FONT> <BR><FONT size=2>Dec 26 09:50:16 FIREWALL dhclient: New Subnet Mask (rl0): 255.255.255.0</FONT> <BR><FONT size=2>Dec 26 09:50:16 FIREWALL dhclient: New Broadcast Address(rl0): 192.168.100.255</FONT> <BR><FONT size=2>Dec 26 10:23:49 FIREWALL natd[284]: failed to write packet back (No route to host)</FONT> <BR><FONT size=2>Dec 26 10:23:51 FIREWALL natd[284]: failed to write packet back (No route to host)</FONT> <BR><FONT size=2>Dec 26 10:23:51 FIREWALL dhclient: New IP Address(rl0): 192.168.100.11</FONT> <BR><FONT size=2>Dec 26 10:23:51 FIREWALL dhclient: New Subnet Mask (rl0): 255.255.255.0</FONT> <BR><FONT size=2>Dec 26 10:23:51 FIREWALL dhclient: New Broadcast Address(rl0): 192.168.100.255</FONT> <BR><FONT size=2>Dec 26 10:24:43 FIREWALL natd[284]: failed to write packet back (No route to host)</FONT> <BR><FONT size=2>Dec 26 10:24:51 FIREWALL natd[284]: failed to write packet back (No route to host)</FONT> <BR><FONT size=2>Dec 26 10:24:52 FIREWALL dhclient: New IP Address(rl0): 192.168.100.11</FONT> <BR><FONT size=2>Dec 26 10:24:52 FIREWALL dhclient: New Subnet Mask (rl0): 255.255.255.0</FONT> <BR><FONT size=2>Dec 26 10:24:52 FIREWALL dhclient: New Broadcast Address(rl0): 192.168.100.255</FONT> <BR><FONT size=2>Dec 26 10:26:40 FIREWALL natd[284]: failed to write packet back (No route to host)</FONT> <BR><FONT size=2>Dec 26 10:26:43 FIREWALL natd[284]: failed to write packet back (No route to host)</FONT> <BR><FONT size=2>Dec 26 10:26:43 FIREWALL dhclient: New IP Address(rl0): 192.168.100.11</FONT> <BR><FONT size=2>Dec 26 10:26:43 FIREWALL dhclient: New Subnet Mask (rl0): 255.255.255.0</FONT> <BR><FONT size=2>Dec 26 10:26:43 FIREWALL dhclient: New Broadcast Address(rl0): 192.168.100.255</FONT> <BR><FONT size=2>Dec 26 10:39:01 FIREWALL /kernel: arp: 00:20:40:e3:1d:7b is using my IP address 0.0.0.0!</FONT> <BR><FONT size=2>Dec 26 10:39:01 FIREWALL last message repeated 51 times</FONT> <BR><FONT size=2>Dec 26 11:37:59 FIREWALL /kernel: arp: 00:20:40:e3:1d:7b is using my IP address 0.0.0.0!</FONT> <BR><FONT size=2>Dec 26 11:37:59 FIREWALL last message repeated 256 times</FONT> <BR><FONT size=2>Dec 26 11:52:13 FIREWALL natd[284]: failed to write packet back (No route to host)</FONT> <BR><FONT size=2>Dec 26 12:20:47 FIREWALL login: ROOT LOGIN (root) ON ttyv0</FONT> <BR><FONT size=2>Dec 26 12:24:02 FIREWALL natd[284]: failed to write packet back (No route to host)</FONT> <BR><FONT size=2>Dec 26 12:24:02 FIREWALL last message repeated 64 times</FONT> <BR><FONT size=2>Dec 26 12:26:18 FIREWALL last message repeated 5 times</FONT> <BR><FONT size=2>Dec 26 12:26:18 FIREWALL dhclient: New IP Address(rl0): 213.73.160.xxx</FONT> <BR><FONT size=2>Dec 26 12:26:18 FIREWALL dhclient: New Subnet Mask (rl0): 255.255.255.0</FONT> <BR><FONT size=2>Dec 26 12:26:18 FIREWALL dhclient: New Broadcast Address(rl0): 213.73.160.255</FONT> <BR><FONT size=2>Dec 26 12:26:18 FIREWALL dhclient: New Routers: 213.73.160.1</FONT> </P> <P><FONT size=2>It is very strange and i do not understand what may have happend here. Was it a error by my ISP or was it a intrusion attempt?</FONT></P> <P><FONT size=2>After this i killed my dhclient and started it up again, assigning me my original ip address. And everything was fine.</FONT> <BR><FONT size=2>But I would like to know what happend here. Anyone have some ideas??</FONT> <BR><FONT size=2>I would like to hear them!</FONT> </P> <P><FONT size=2>Sincerly</FONT> <BR><FONT size=2>Stef</FONT> </P></BLOCKQUOTE></BODY></HTML>
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