9 Jul
2013
9 Jul
'13
6:23 p.m.
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Hi.
What do you think about this?
https://github.com/p4u/dhcpdiscover
Could be useful for us? It can be executed to know if there are DHCP
servers (different to you) in a network interface.
root@qMp76:/tmp# dhcpdiscover -i br-lan
DHCP ok: Received 1 DHCPOFFER(s), max lease time = 3600 sec.
root@qMp76:/tmp# dhcpdiscover -i br-lan -b 172.30.22.1
DHCP offer comming from the banned addr 172.30.22.1, ignoring it
DHCP problem: No DHCPOFFERs were received.
Could be used for knowing if a network device is plugged to a WAN
modem or not.
Cheers
- --
./p4u
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17 Oct
17 Oct
7:46 a.m.
Mando algo que me habia quedado colgado en el outbox, una forma simple
de chequear dhcp servers con udhcpc
On 07/14/2013 03:34 PM, Gioacchino Mazzurco wrote:
On Tuesday, July 09, 2013 08:23:34 PM Pau wrote:
(08:20:49 PM) mrkiko: the problem is ethernet - how is it possible to
check if ethernet connectivity is actually available in an event-based
way? So, since ifup implies ifdown and then ifup, I was thinking to try
to ifup the interface and verify with ifstatus if things gone well
(08:21:26 PM) jow_laptop: you want to chack ethernet availability
without actually bring the interface up? like a dry-run?
(08:21:31 PM) jow_laptop: s/chack/check/
(08:21:52 PM) mrkiko: yes
(08:21:56 PM) mrkiko: exactly that
(08:22:36 PM) mrkiko: I might also manage to do it by hand - with the ip
command and ping... but I would not be so happy :)
(08:22:38 PM) jow_laptop: udhcpc -n -q -s /bin/true -t 1 -i eth1
Could be useful for us? It can be executed to
know if there are DHCP
servers (different to you) in a network interface.
/dev/null && echo "there is dhcp" ||
echo "there is no dhcp"
(08:22:56 PM) mrkiko: ah
(08:23:23 PM) mrkiko: yeah - you changed my day - for the second time
(08:23:32 PM) jow_laptop: the trick is to invoke udhcpc with a dummy
script (/bin/true) that does simply nothing with the received lease
(08:23:43 PM) mrkiko: I looked ad udhcp help various times without noticing
(08:25:08 PM) jow_laptop: you might need to ifconfig eth1 up / ip link
set dev eth1 up before calling udhcpc
(08:25:13 PM) jow_laptop: not sure if it does it by itself
(08:25:48 PM) mrkiko: Infact I need to do so
(08:25:52 PM) mrkiko: and I will :)
(08:25:56 PM) jow_laptop: also a larger timeout etc.
(08:26:04 PM) jow_laptop: not any dhcp server might be that fast
I didn't take a look at code but as i said in the
past the idea seems useful
;)
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6:35 p.m.
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Cool!
But the advantages of the dhcpdiscover are two:
- - it does not ask for a dhcp lesse (it does not send the last ACK), so
there is not "footprint" for trying to discover it
- - you can ignore a dhcp server by IP, so you can run your own dhcp
server and find out if there is some other in the network
On 17/10/13 09:46, Gui Iribarren wrote:
Mando algo que me habia quedado colgado en el outbox,
una forma
simple de chequear dhcp servers con udhcpc
On 07/14/2013 03:34 PM, Gioacchino Mazzurco wrote:
- --
./p4u
On Tuesday, July 09, 2013 08:23:34 PM Pau wrote:
(08:20:49 PM) mrkiko: the problem is ethernet - how is it possible
to check if ethernet connectivity is actually available in an
event-based way? So, since ifup implies ifdown and then ifup, I was
thinking to try to ifup the interface and verify with ifstatus if
things gone well (08:21:26 PM) jow_laptop: you want to chack
ethernet availability without actually bring the interface up? like
a dry-run? (08:21:31 PM) jow_laptop: s/chack/check/ (08:21:52 PM)
mrkiko: yes (08:21:56 PM) mrkiko: exactly that (08:22:36 PM)
mrkiko: I might also manage to do it by hand - with the ip command
and ping... but I would not be so happy :) (08:22:38 PM)
jow_laptop: udhcpc -n -q -s /bin/true -t 1 -i eth1
Could be useful for us? It can be executed to
know if there are
DHCP servers (different to you) in a network interface.
/dev/null && echo "there is
dhcp" || echo "there is no dhcp"
(08:22:56 PM) mrkiko: ah (08:23:23
PM) mrkiko: yeah - you changed
my day - for the second time (08:23:32 PM) jow_laptop: the trick is
to invoke udhcpc with a dummy script (/bin/true) that does simply
nothing with the received lease (08:23:43 PM) mrkiko: I looked ad
udhcp help various times without noticing (08:25:08 PM) jow_laptop:
you might need to ifconfig eth1 up / ip link set dev eth1 up before
calling udhcpc (08:25:13 PM) jow_laptop: not sure if it does it by
itself (08:25:48 PM) mrkiko: Infact I need to do so (08:25:52 PM)
mrkiko: and I will :) (08:25:56 PM) jow_laptop: also a larger
timeout etc. (08:26:04 PM) jow_laptop: not any dhcp server might be
that fast
I didn't take a look at code but as i said
in the past the idea
seems useful ;) _______________________________________________
Dev mailing list Dev(a)lists.libre-mesh.org
https://lists.libre-mesh.org/mailman/listinfo/dev
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3844
days inactive
3944
days old
3 comments
3 participants
participants (3)
-
Gioacchino Mazzurco -
Gui Iribarren -
Pau