[prev in list] [next in list] [prev in thread] [next in thread] 

List:       ipcop-user
Subject:    Re: [IPCop-user] DHCP giving out wrong subnet IP
From:       "Joe Acquisto-j4" <joea () j4computers ! com>
Date:       2017-04-07 17:11:46
Message-ID: 58E790120200008500068532 () mail
[Download RAW message or body]

> > > On 4/7/2017 at 1:51 AM, Administrator <admin@different-perspectives.com>
wrote:
> On Wednesday, 5 April 2017 13:35:09 BST Joe Acquisto-j4 wrote:
> > Below is a snippet of the /var/messages log (dhcp tags only) from the date
> > it was happening.  At one point, I unplugged the patch cord from the wlan
> > port of the IPCop box and had the client request DHCP.    It then got the
> > correct fixed lan address.
> > 
> > Apr  4 19:39:25 ipcop dnsmasq-dhcp[1199]:
> > DHCPINFORM(lan-1) 192.168.11.199 aa:bb:cc:dd:ee:ff Apr  4 19:39:25 ipcop
> > dnsmasq-dhcp[1199]: DHCPACK(lan-1) 192.168.11.199 aa:bb:cc:dd:ee:ff
> > MININT-O9ERFLG Apr  4 19:39:28 ipcop dnsmasq-dhcp[1199]: DHCPINFORM(lan-1)
> > 192.168.11.199 aa:bb:cc:dd:ee:ff Apr  4 19:39:28 ipcop dnsmasq-dhcp[1199]:
> > DHCPACK(lan-1) 192.168.11.199 aa:bb:cc:dd:ee:ff MININT-O9ERFLG Apr  4
> > 19:39:36 ipcop dnsmasq-dhcp[1199]: DHCPINFORM(lan-1) 192.168.11.199
> > aa:bb:cc:dd:ee:ff Apr  4 19:39:36 ipcop dnsmasq-dhcp[1199]: DHCPACK(lan-1)
> > 192.168.11.199 aa:bb:cc:dd:ee:ff MININT-O9ERFLG Apr  4 19:39:39 ipcop
> > dnsmasq-dhcp[1199]: DHCPINFORM(lan-1) 192.168.11.199 aa:bb:cc:dd:ee:ff Apr 
> > 4 19:39:39 ipcop dnsmasq-dhcp[1199]: DHCPACK(lan-1) 192.168.11.199
> > aa:bb:cc:dd:ee:ff MININT-O9ERFLG Apr  4 19:42:27 ipcop dnsmasq-dhcp[1199]:
> > DHCPDISCOVER(lan-1) 192.168.11.199 aa:bb:cc:dd:ee:ff Apr  4 19:54:32 ipcop
> > dnsmasq-dhcp[1199]: DHCPOFFER(wlan-1) 192.168.11.199 aa:bb:cc:dd:ee:ff
> 
> Your don't say (information is useful) so I'm assuming that the 
> 192.168.11.199 
> address is in your blue subnet and the connection is on your green one.

Ah, well, yes, 192.168.11.0 is the BLUE subnet (wlan) , 191.168.0.0 is GREEN (lan-1).

The clients are on the wired lan-1.  The one in the snippet is actually assigned a \
fixed  lease on lan-1.    So, to me, it should *never* get assigned an address other \
than that. 

A "wrong" (BLUE) address has also been handed out to a much abused laptop, on its \
wired interface, same simple hub/switch as the other box while installing and testing \
CentOS 7 and OpenSuse.   I've since changed that hub  out, for other reasons and the \
issue continues.  As one might expect.

If you have some further enlightening words this may have effervesced, please feel \
free.  Otherwise, I will attempt to follow up on your other points.

Thanks fof the feeedback.

joe a.

> Three immediate things from this log:
> 1) a quick search of the internet shows that (broken) windows clients 
> repeatedly send out DHCPINFORMs if they don't receive proxy information in 
> the 
> DHCP info.  There are multiple fixes available.  A search will find them for 
> 
> you.
> 
> 2) The client has an IP Address in a non-default range, so it was given it 
> some time by something.  Valid addresses don't appear by magic, so either: 
> it's old - from a previous network; it's old - from a previous configuration 
> of 
> this network; it's connected to your Blue network at some time and is now 
> trying to reuse these parameters; you've manually configured it on the 
> client, 
> at some time.
> 
> 3) dhcpmasq is again acking a wrong address.
> 
> I'd suggest:
> 1) research and change the dhcpmasq parameters so the dhcpinforms stop.  You 
> 
> can't fix a broken window.
> 
> 2) tell the offending clients so the release the IP Address and then request 
> a 
> new one.
> 
> 3) log a defect report on ipcop.
> 
> Yours
> David
> 
> ------------------------------------------------------------------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot 
> _______________________________________________
> IPCop-user mailing list
> IPCop-user@lists.sourceforge.net 
> Manage your subscription or unsubscribe
> https://lists.sourceforge.net/lists/listinfo/ipcop-user 




------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
IPCop-user mailing list
IPCop-user@lists.sourceforge.net
Manage your subscription or unsubscribe
https://lists.sourceforge.net/lists/listinfo/ipcop-user


[prev in list] [next in list] [prev in thread] [next in thread]