Hello,
I'm no expert in this particular subject, but you might check tcpdump
while a client tries to obtain a DHCP address. Maybe the switch you use
is filling arp tables or something..
Bebbet
On 28-5-2016 21:05, mj wrote:
> Hi,
>
> No replies, so I'm posting it again. We're just looking for some feedback...
>
> We have complaints that (during peak hours) users have difficulties
> connecting to our packetfence 5.6.1 system, inline mode, running on
> debian 7.
>
> Here is our email from two days ago again:
>
> We have occasional problems with devices that cannot connect. The logs
> on the clientdevice indicate that client dhcp is trying to obtain an
> address:
>> May 23 17:07:56 T430s dhclient: DHCPREQUEST of 10.19.227.120 on eth0 to
>> 255.255.255.255 port 67 (xid=0x70d4fac)
>> May 23 17:08:02 T430s dhclient: DHCPREQUEST of 10.19.227.120 on eth0 to
>> 255.255.255.255 port 67 (xid=0x762d63ef)
>> May 23 17:08:17 T430s dhclient: DHCPREQUEST of 10.19.227.120 on eth0 to
>> 255.255.255.255 port 67 (xid=0x399c2476)
> However: NONE of the above requests are logged in the pfdhcplistener.log
> file.
>
> When the client tries again a fourth time:
>> May 23 17:08:20 T430s dhclient: DHCPREQUEST of 10.19.227.120 on eth0 to
>> 255.255.255.255 port 67 (xid=0x399c2476)
> THEN suddenly this request IS detected and logged in pfdhcplistener.log:
>> May 23 17:08:20 pfqueue(21972) INFO: [mac:unknown] DHCPREQUEST from
>> 3c:97:0e:2f:14:f8 (10.19.227.120) (pf::dhcp::processor::parse_dhcp_request)
>> May 23 17:08:22 pfqueue(21972) INFO: [mac:3c:97:0e:2f:14:f8]
>> 3c:97:0e:2f:14:f8 requested an IP with the following informations: last_dhcp
>> = 2016-05-23 17:08:20,computername = T430s,dhcp_fingerprint =
>> 1,28,2,3,15,6,119,12,44,47,26,121,42,121,249,33,252,42,dhcp_vendor =
>> (pf::dhcp::processor::process_packet)
>
> and this request is also answered, and my client can connect:
>> May 23 17:08:21 T430s dhclient: DHCPACK of 10.19.227.120 from 10.19.0.1
>> May 23 17:08:21 T430s dhclient: bound to 10.19.227.120 -- renewal in 7226165
>> seconds.
>
> Our question: Is it expected that so many requests (we have more
> examples like this) go 'unnoticed' in pfdhcplistener.log, and also seem
> to be left unanswered? (should we check different logfiles, perhaps?)
>
> Are we on to something, or are we looking in the wrong files..? (or
> misunderstanding packetfence workings..?)
>
> Is there a maximum number of dhcp requests packetfence can handle..?
> (we're talking perhaps 200 clients inline, that's not too much, I guess..?)
>
> Feedback would be appreciated!
>
> MJ
>
> ------------------------------------------------------------------------------
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What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
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consuming the most bandwidth. Provides multi-vendor support for NetFlow,
J-Flow, sFlow and other flows. Make informed decisions using capacity
planning reports. https://ad.doubleclick.net/ddm/clk/305295220;132659582;e
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What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
patterns at an interface-level. Reveals which users, apps, and protocols are
consuming the most bandwidth. Provides multi-vendor support for NetFlow,
J-Flow, sFlow and other flows. Make informed decisions using capacity
planning reports. https://ad.doubleclick.net/ddm/clk/305295220;132659582;e
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