Re: [Dnsmasq-discuss] problem with loopback and 2.77test5

[Simon Kelley]

On 15/05/17 11:20, Kevin Darbyshire-Bryant wrote:
> 
> 
> On 15/05/17 11:06, Bastian Bittorf wrote:
>> * Simon Kelley  [12.05.2017 08:33]:
>>> Oops. "It compiles - ship it" bites back.
>>>
>>> 2.77rc3 fixes this, and we're currently eating the dog-food chez Kelley.
>>
>> just to mention it, the loopback-thingy is working fine now on my side
>> with rc3.
>> Thanks a lot!
> 
> Cheers Bastian,
> 
> To confirm, no obvious screaming in LEDEland with rc3, in fact the 'DS
> queries' fix has solved at least 2 reports of SIGSEGV.  That's good news
> I think.
> 
> Kevin
> 

This is all good. I've made a (hopefully) last rc4, mainly because none
of the others have actually been formally announced. If nobody screams
in a few days. 2.77 is go.

I just realised that the anniversary of the release of 2.76 was couple
of days ago. A year between releases in unprecedented.


Cheers,

Simon.

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Re: [Dnsmasq-discuss] problem with loopback and 2.77test5

[Kevin Darbyshire-Bryant]

On 15/05/17 11:06, Bastian Bittorf wrote:

* Simon Kelley  [12.05.2017 08:33]:

Oops. "It compiles - ship it" bites back.

2.77rc3 fixes this, and we're currently eating the dog-food chez Kelley.


just to mention it, the loopback-thingy is working fine now on my side with rc3.
Thanks a lot!


Cheers Bastian,

To confirm, no obvious screaming in LEDEland with rc3, in fact the 'DS 
queries' fix has solved at least 2 reports of SIGSEGV.  That's good news 
I think.


Kevin

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Re: [Dnsmasq-discuss] problem with loopback and 2.77test5

[Simon Kelley]

Oops. "It compiles - ship it" bites back.

2.77rc3 fixes this, and we're currently eating the dog-food chez Kelley.


Cheers,

Simon.

On 11/05/17 15:49, Kevin Darbyshire-Bryant wrote:
> 
> 
> On 10/05/17 22:31, Simon Kelley wrote:
>> Just committed a patch which should make this work again without needing
>> --no-ping.
>>
>> I've tagged it as 2.77rc2, so please could a LEDE package be built, and
>> this behaviour tested.
> 
> I tried rc2 and think there's a problem with DHCPv4 leasesie. It
> doesn't give them out any more.
> 
> It was a *very* quick test before I had to dash out of the door so not
> exactly thorough.
> 


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Re: [Dnsmasq-discuss] problem with loopback and 2.77test5

[Kevin Darbyshire-Bryant]

On 11/05/17 21:09, Simon Kelley wrote:

Oops. "It compiles - ship it" bites back.

2.77rc3 fixes this, and we're currently eating the dog-food chez Kelley.


Woof!


Currently building a LEDE release, assuming no obvious issue pops up, a 
pull request into LEDE master will follow...and then...the world :-)


Kevin

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Re: [Dnsmasq-discuss] problem with loopback and 2.77test5

[Kevin Darbyshire-Bryant]

On 10/05/17 22:31, Simon Kelley wrote:

Just committed a patch which should make this work again without needing
--no-ping.

I've tagged it as 2.77rc2, so please could a LEDE package be built, and
this behaviour tested.


I tried rc2 and think there's a problem with DHCPv4 leasesie. It 
doesn't give them out any more.


It was a *very* quick test before I had to dash out of the door so not 
exactly thorough.


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Re: [Dnsmasq-discuss] problem with loopback and 2.77test5

[Simon Kelley]

Just committed a patch which should make this work again without needing
--no-ping.

I've tagged it as 2.77rc2, so please could a LEDE package be built, and
this behaviour tested.


Cheers,


Simon.

On 10/05/17 14:11, Bastian Bittorf wrote:
> * Simon Kelley  [10.05.2017 15:05]:
>> I wonder if this is to do with the extension of the ping-test to more
>> cases. Please could you try adding
>>
>> no-ping
>>
>> to the config, and see if that improves things?
> 
> thank you - yes, that works...now the log shows:
> 
> dnsmasq-dhcp[28815]: DHCPREQUEST(lo) 127.0.0.2 00:00:00:00:00:00
> dnsmasq-dhcp[28815]: DHCPACK(lo) 127.0.0.2 00:00:00:00:00:00 lo-alias
> dnsmasq-dhcp[28815]: ARP-cache injection failed: Invalid argument
> 
> could it be, because 'loopback' is not arp-able?
> 
> bye, bastian
> 




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Re: [Dnsmasq-discuss] problem with loopback and 2.77test5

[Simon Kelley]

On 10/05/17 14:11, Bastian Bittorf wrote:
> * Simon Kelley  [10.05.2017 15:05]:
>> I wonder if this is to do with the extension of the ping-test to more
>> cases. Please could you try adding
>>
>> no-ping
>>
>> to the config, and see if that improves things?
> 
> thank you - yes, that works...now the log shows:
> 
> dnsmasq-dhcp[28815]: DHCPREQUEST(lo) 127.0.0.2 00:00:00:00:00:00
> dnsmasq-dhcp[28815]: DHCPACK(lo) 127.0.0.2 00:00:00:00:00:00 lo-alias
> dnsmasq-dhcp[28815]: ARP-cache injection failed: Invalid argument
> 
> could it be, because 'loopback' is not arp-able?

Actually, its the sort-of opposite. loopback seems to respond to any
address in 127.0.0.0/8 so you get a reply to an ICMP echo request from
any 127.0.0.0/8 address, even if the loopback interface doesn't
explicitly have that address

srk@holly:~/dnsmasq/dnsmasq$ ifconfig lo
loLink encap:Local Loopback
  inet addr:127.0.0.1  Mask:255.0.0.0
  inet6 addr: ::1/128 Scope:Host
  UP LOOPBACK RUNNING  MTU:65536  Metric:1
  RX packets:2194 errors:0 dropped:0 overruns:0 frame:0
  TX packets:2194 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:1
  RX bytes:164612 (164.6 KB)  TX bytes:164612 (164.6 KB)

srk@holly:~/dnsmasq/dnsmasq$ ping 127.0.0.2
PING 127.0.0.2 (127.0.0.2) 56(84) bytes of data.
64 bytes from 127.0.0.2: icmp_seq=1 ttl=64 time=0.068 ms
64 bytes from 127.0.0.2: icmp_seq=2 ttl=64 time=0.065 ms
^C
--- 127.0.0.2 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms

I'll patch it to suppress ping-checks for the loopback interface.

Cheers,

Simon.



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Re: [Dnsmasq-discuss] problem with loopback and 2.77test5

[Simon Kelley]

Yes. I'll look at putting code to suppress the ARP check. on loopback.

Cheers,

Simon.


On 10/05/17 14:11, Bastian Bittorf wrote:
> * Simon Kelley  [10.05.2017 15:05]:
>> I wonder if this is to do with the extension of the ping-test to more
>> cases. Please could you try adding
>>
>> no-ping
>>
>> to the config, and see if that improves things?
> 
> thank you - yes, that works...now the log shows:
> 
> dnsmasq-dhcp[28815]: DHCPREQUEST(lo) 127.0.0.2 00:00:00:00:00:00
> dnsmasq-dhcp[28815]: DHCPACK(lo) 127.0.0.2 00:00:00:00:00:00 lo-alias
> dnsmasq-dhcp[28815]: ARP-cache injection failed: Invalid argument
> 
> could it be, because 'loopback' is not arp-able?
> 
> bye, bastian
> 



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Re: [Dnsmasq-discuss] problem with loopback and 2.77test5

[Bastian Bittorf]

* Simon Kelley  [10.05.2017 15:05]:
> I wonder if this is to do with the extension of the ping-test to more
> cases. Please could you try adding
> 
> no-ping
> 
> to the config, and see if that improves things?

thank you - yes, that works...now the log shows:

dnsmasq-dhcp[28815]: DHCPREQUEST(lo) 127.0.0.2 00:00:00:00:00:00
dnsmasq-dhcp[28815]: DHCPACK(lo) 127.0.0.2 00:00:00:00:00:00 lo-alias
dnsmasq-dhcp[28815]: ARP-cache injection failed: Invalid argument

could it be, because 'loopback' is not arp-able?

bye, bastian

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Re: [Dnsmasq-discuss] problem with loopback and 2.77test5

[Simon Kelley]

I wonder if this is to do with the extension of the ping-test to more
cases. Please could you try adding

no-ping

to the config, and see if that improves things?


Cheers,

Simon.


On 10/05/17 11:56, Bastian Bittorf wrote:
> here the relevant things with recent lede-project.org
> 
> root@box:~ dnsmasq -v
> Dnsmasq version 2.77test5  Copyright (c) 2000-2016 Simon Kelley
> Compile time options: IPv6 GNU-getopt no-DBus no-i18n no-IDN DHCP
> no-DHCPv6 no-Lua TFTP no-conntrack no-ipset no-auth no-DNSSEC no-ID
> loop-detect inotify
> 
> # kernel tested with non working version: 4.4.61
> # kernel tested with working version 4.4.56
> 
> # this is repeating in syslog every 3 seconds:
> Wed May 10 12:47:55 2017 daemon.warn dnsmasq-dhcp[21993]:
>  not using configured address 127.0.0.2 because it is in use by another host
> Wed May 10 12:47:55 2017 daemon.info dnsmasq-dhcp[21993]:
>  DHCPDISCOVER(lo) 00:00:00:00:00:00 no address available
> 
> # here the exact same config which is working with 2.77test4:
> root@box:~ :) cat /var/etc/dnsmasq.conf.cfg02411c
> # auto-generated config file from /etc/config/dhcp
> conf-file=/etc/dnsmasq.conf
> dhcp-authoritative
> localise-queries
> read-ethers
> expand-hosts
> dhcp-script=/etc/dhcp-script.d/10dhcpscript
> cache-size=1000
> domain=internet
> server=/internet/
> server=8.8.8.8
> except-interface=eth0.2
> except-interface=wlan0-1
> except-interface=wlan1-1
> addn-hosts=/var/run/hosts_olsr
> addn-hosts=/etc/local.hosts
> dhcp-leasefile=/tmp/dhcp.leases
> resolv-file=/tmp/resolv.conf.auto
> dhcp-broadcast=tag:needs-broadcast
> addn-hosts=/tmp/hosts
> conf-dir=/tmp/dnsmasq.d
> user=dnsmasq
> group=dnsmasq
> 
> dhcp-host=00:00:00:00:00:00,127.0.0.2,lo-alias
> 
> bogus-priv
> conf-file=/usr/share/dnsmasq/rfc6761.conf
> dhcp-range=set:lan,10.63.22.98,10.63.22.110,255.255.255.240,48h
> dhcp-range=set:mastergate,100.66.19.2,100.66.19.254,255.192.0.0,12h
> dhcp-option=mastergate,3,100.64.0.1
> dhcp-option=mastergate,6,100.64.0.1
> no-dhcp-interface=eth0.2
> dhcp-range=set:loopback,127.0.0.2,127.0.0.3,255.0.0.0,1h
> # end-of-config
> 
> 
> # on a working version i get a lease:
> root@box:~ :) cat /tmp/dhcp.leases 
> 1494416311 00:00:00:00:00:00 127.0.0.2 lo-alias *
> 
> we use this "strange" method, for checking if everything is
> working and the lease gets renewed (and some hotplug scripts are
> fired)
> 
> thanks & bye, bastian
> 
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