iptables

[JD]

On 12/07/2012 09:42 PM, Tom H wrote:
> On Fri, Dec 7, 2012 at 5:53 PM, JD <jd1008 at gmail.com> wrote:
>> On 12/07/2012 03:13 PM, Tom H wrote:
>>> On Fri, Dec 7, 2012 at 4:25 PM, JD <jd1008 at gmail.com> wrote:
>>>> On 12/07/2012 10:33 AM, Tom H wrote:
>>>>> On Fri, Dec 7, 2012 at 11:43 AM, JD <jd1008 at gmail.com> wrote:
>
>>>>>> I just ran nm-tool and it reports - Device: wlan0
>>>>>> ---------------------------------------------------------------- Type:
>>>>>> 802.11 WiFi Driver: ath9k State: unmanaged Default: no HW Address:
>>>>>> 00:23:80:00:03:0A So how is it that NM no longer manages wlan0? And why is
>>>>>> it set to default to no? It was coming up just fine before In installed ufw
>>>>>> and enabled it. In fact, I was on wifi connection when a respondent to my
>>>>>> question re: iptables, suggested I use ufw.
>>>>> Do you have any NIC other than "lo" defined in
>>>>> "/etc/network/interfaces"?
>>>> The is the default interfaces file that came with the installation of
>>>> 12.10 or it was inherited from 12.04: auto lo eth0 wlan0 allow-hotplug eth0
>>>> iface lo inet loopback
>>> 1) "allow-hotplug" isn't used in Ubuntu, which uses "allow-auto" (or its
>>> shorter equivalent, "auto").
>> Thanx Tom, But, I did not add the "allow-hotplug"
>> So why is it there in the first place?
> It's used in Debian and beings up NICs in conjunction with udev. It
> cannot have landed there on its own.
>
>
>>> 2) If you don't set "managed=true" in the "ifupdown" section of
>>> "/etc/NetworkManager/dispatcher.d/01ifupdown", NM won't manage a NIC defined
>>> in "/etc/network/interfaces".
>> But the file /etc/NetworkManager/dispatcher.d/01ifupdown
>> does  not even have
>> managed=false
>> and it comes from the full install.
>> So, why would it require the user to add
>> managed=true
>>
>> It seems to me that ubuntu truly is lacking in rubust NM and network
>> interfaces management software.
>> They user should NEVER have to edit these system files.
>> Much too dangerous and very prone to error.
>> It should all be done by gui software with drop-down menus/choices ...etc.
>> I am new to ubuntu, and I was hooping that it's system admin software was
>> not left up to the user to edit such files, but rather to configure their
>> content via a gui configuration tool.
> Not "/etc/NetworkManager/dispatcher.d/01ifupdown",
> "/etc/NetworkManager/NetworkManager.conf".
>
> Sorry my mind was on your previous thread about iptables; I'd been
> wondering about whether NM could trigger an iptables script in
> "/etc/network/if-pre-up.d" and google pointed to that 01ifupdown
> script. Sorry.
>
> You have a non-standard setup ("allow-hotplug"!), so NM's not working
> properly... My parents use Ubuntu and NM without a hitch and have been
> doing so for years. If you just install Ubuntu out of the box, NM
> works just fine - or ifupdown if NM's not installed. AFAIK there's no
> GUI to manage ifupdown post-install. NM has a GUI, nm-applet, but
> AFAIK you can't choose which NIC to control via NM and which not to
> control from within it; that's a tick box that's sorely needed...
>
> NM has plugins. Some of them deal with integrating the pre-NM
> networking tools of a distro with NM. The Debian/Ubuntu one's called
> "ifupdown" and the RH one's called "ifcfg-rh". These plugins are
> activated by listing them in "/etc/NetworkManager/NetworkManager.conf"
> and they're listed/activated by default in their respective distros,
> But NM's, unsurprisingly, more seamlessly integrated into RHEL/Fedora.
>
> In RHEL/Fedora, if NM's installed and enabled, it'll control a NIC
> defined in "/etc/sysconfig/network-scripts/ifcfg-<nic>" unless the
> latter includes a "NM_CONTROLLED=no" line (the default is
> "NM_CONTROLLED=yes").
>
> In Debian/Ubuntu, if NM's installed and enabled, it'll control a NIC
> defined in "/etc/network/interfaces" if "managed=true" is set in
> "/etc/NetworkManager/NetworkManager.conf", but the default's
> "managed=false". There were two silly decisions that were made: 1)
> setting "managed=false" as the default and 2) hiding the on/off switch
> in "/etc/NetworkManager/NetworkManager.conf" rather than having it in
> "/etc/network/interfaces".
>
Right.
I checked that and made the changes and things a re looking much better.
2 problems remain.
1. It sets up /etc/resolv.conf to use nameserver 127.0.0.1
     resumably, because dnsmasq is also running. However,
     nothing gets resolved, because dnsmasq (or networkManager)
     are not querying the AP for the DNS settings, and so there is
     no conf file for dnsmasq containing the actual nameservers' ip 
addresses.
     So, at every boot, I have to change the IP address of nameserver from
     127.0.0.1 to 192.168.1.254
2. The default route is  not being set either. When I run
     route -n
     it does not show the default route as my AP ip addres,
     so I have to manually do
     route add default gw 192.168.1.254
     Without this, I am unable to reach internet sites.