dhclient sending request to port 67 locking system up

[Colin Law]

Forwarding this to the list so others can comment

Colin

On 7 November 2017 at 17:35, Scott Blair <scott.blair at gmail.com> wrote:
> On 11/07/2017 10:54 AM, Colin Law wrote:
>>
>> On 6 November 2017 at 17:24, Scott Blair <scott.blair at gmail.com> wrote:
>>>
>>> I have been getting the following errors in my syslog file and it is
>>> causing
>>> my system to hard lock.
>>>
>>>
>>> dhclient[1300]: DHCPREQUEST of 192.168.0.108 on enp6s0 to 192.168.0.1
>>> port
>>> 67 (xid=0x7a4f385)
>>>
>>> dhclient[1300]: send_packet: Operation not permitted
>>
>> I don't think those messages are causing a lock (assuming you mean a
>> complete computer lockup),
>
> By hard lockup, I mean that the keyboard and mouse don't work. The caps lock
> key nor the num lock key doesn't work.
>
>>   they may be a symptom of some underlying
>> problem. Give us some more detail on the symptoms and the history of
>> the system (just installed, used to work and suddenly started failing,
>> etc).
>
> New system about 3 months old. AMD FX-8300 CPU, 16 gigs DDR3 ram, Dual AMD
> Radeon R7 360 crossfired.
> Ubuntu 16.04 on a separate 1TB drive from Windows 10. It has locked up twice
> in the past with different entries in the syslog, but I was able to fix
> those problems.
> This error has happened about 5 times now.
> The above error is repeated for a good 22 minutes.
> Here is the the beginning of it starting in the syslog:
>
> Nov  6 21:22:22 main dhclient[1370]: DHCPREQUEST of 192.168.0.108 on enp6s0
> to 192.168.0.1 port 67 (xid=0x627803b)
> Nov  6 21:22:22 main dhclient[1370]: send_packet: Operation not permitted
> Nov  6 21:22:22 main dhclient[1370]: dhclient.c:2386: Failed to send 300
> byte long packet over fallback interface.
> Nov  6 21:22:24 main kernel: [34558.157819] [UFW BLOCK] IN=enp6s0 OUT=
> MAC=01:00:5e:00:00:01:14:cc:20:0c:91:76:08:00 SRC=192.168.0.1 DST=224.0.0.1
> LEN=32 TOS=0x00 PREC=0xC0 TTL=1 ID=0 DF PROTO=2
> Nov  6 21:22:30 main kernel: [34564.134253] [UFW BLOCK] IN=enp6s0 OUT=
> MAC=01:00:5e:00:00:fb:40:b4:cd:b1:5b:9f:08:00 SRC=192.168.0.101
> DST=224.0.0.251 LEN=32 TOS=0x00 PREC=0xC0 TTL=1 ID=0 DF PROTO=2
> Nov  6 21:22:34 main dhclient[1370]: DHCPREQUEST of 192.168.0.108 on enp6s0
> to 192.168.0.1 port 67 (xid=0x627803b)
> Nov  6 21:22:34 main dhclient[1370]: send_packet: Operation not permittedNov
> 6 21:22:22 main dhclient[1370]: DHCPREQUEST of 192.168.0.108 on enp6s0 to
> 192.168.0.1 port 67 (xid=0x627803b)
> Nov  6 21:22:22 main dhclient[1370]: send_packet: Operation not permitted
> Nov  6 21:22:22 main dhclient[1370]: dhclient.c:2386: Failed to send 300
> byte long packet over fallback interface.
> Nov  6 21:22:24 main kernel: [34558.157819] [UFW BLOCK] IN=enp6s0 OUT=
> MAC=01:00:5e:00:00:01:14:cc:20:0c:91:76:08:00 SRC=192.168.0.1 DST=224.0.0.1
> LEN=32 TOS=0x00 PREC=0xC0 TTL=1 ID=0 DF PROTO=2
> Nov  6 21:22:30 main kernel: [34564.134253] [UFW BLOCK] IN=enp6s0 OUT=
> MAC=01:00:5e:00:00:fb:40:b4:cd:b1:5b:9f:08:00 SRC=192.168.0.101
> DST=224.0.0.251 LEN=32 TOS=0x00 PREC=0xC0 TTL=1 ID=0 DF PROTO=2
> Nov  6 21:22:34 main dhclient[1370]: DHCPREQUEST of 192.168.0.108 on enp6s0
> to 192.168.0.1 port 67 (xid=0x627803b)
> Nov  6 21:22:34 main dhclient[1370]: send_packet: Operation not permitted
>
>
> Here is the last output in the syslog:
>
> Nov  6 21:43:44 main dhclient[1370]: dhclient.c:2386: Failed to send 300
> byte long packet over fallback interface.
> Nov  6 21:43:55 main dhclient[1370]: DHCPREQUEST of 192.168.0.108 on enp6s0
> to 192.168.0.1 port 67 (xid=0x627803b)
> Nov  6 21:43:55 main dhclient[1370]: send_packet: Operation not permitted
> Nov  6 21:43:55 main dhclient[1370]: dhclient.c:2386: Failed to send 300
> byte long packet over fallback interface.
> Nov  6 21:44:05 main dhclient[1370]: DHCPREQUEST of 192.168.0.108 on enp6s0
> to 192.168.0.1 port 67 (xid=0x627803b)
> Nov  6 21:44:05 main dhclient[1370]: send_packet: Operation not permitted
> Nov  6 21:44:05 main dhclient[1370]: dhclient.c:2386: Failed to send 300
> byte long packet over fallback interface.
> Nov  6 21:44:16 main dhclient[1370]: DHCPREQUEST of 192.168.0.108 on enp6s0
> to 192.168.0.1 port 67 (xid=0x627803b)
> Nov  6 21:44:16 main dhclient[1370]: send_packet: Operation not permitted
> Nov  6 21:44:16 main dhclient[1370]: dhclient.c:2386: Failed to send 300
> byte long packet over fallback interface.
> Nov  6 21:44:36 main dhclient[1370]: DHCPREQUEST of 192.168.0.108 on enp6s0
> to 192.168.0.1 port 67 (xid=0x627803b)
> Nov  6 21:44:36 main dhclient[1370]: send_packet: Operation not permitted
> Nov  6 21:44:36 main dhclient[1370]: dhclient.c:2386: Failed to send 300
> byte long packet over fallback interface.
> \00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00
>
>
>
>>
>> Colin
>>
>>> dhclient[1300]: dhclient.c:2386: Failed to send 300 byte long packet over
>>> fallback interface.
>>>
>>> dhclient[1300]: DHCPREQUEST of 192.168.0.108 on enp6s0 to 192.168.0.1
>>> port
>>> 67 (xid=0x7a4f385)
>>>
>>> dhclient[1300]: send_packet: Operation not permitted
>>>
>>>
>>> I opened port 67 in the firewall and that didn't work.
>>>
>>> I also tried this :
>>>
>>> $IPTABLES  -I INPUT -i $LAN_IFACE -p udp --dport 67:68 --sport 67:68 -j
>>> ACCEPT
>>>
>>>
>>>
>>> But it comes back -I command not found.
>>>
>>> Any Ideas?
>>>
>>>
>>>
>>>
>>> Thanks,
>>>
>>> Scott Blair
>>>
>>> USMC Defending your freedoms since 10 November 1775
>>>
>>> Save on backup time "BackupDevice=Null"
>>>
>>> If you don't stand behind our troops,
>>> feel free to stand in front of them.
>>>
>>>
>>> --
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>>>
>
>
>
> Thanks,
>
> Scott Blair
>
> USMC Defending your freedoms since 10 November 1775
>
> Save on backup time "BackupDevice=Null"
>
> If you don't stand behind our troops,
> feel free to stand in front of them.
>