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networking stopped after upgrade

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  networking stopped after upgrade Graham Seaman <navtis@yahoo.co.uk> - 2015-11-03 14:00 +0100
    Re: networking stopped after upgrade Renaud (Ron) OLGIATI <renaud@olgiati-in-paraguay.org> - 2015-11-03 16:20 +0100
      Re: networking stopped after upgrade Graham Seaman <navtis@yahoo.co.uk> - 2015-11-03 16:40 +0100
        Re: networking stopped after upgrade Graham Seaman <navtis@yahoo.co.uk> - 2015-11-05 16:30 +0100

#160167 — networking stopped after upgrade

Hi

For some years I've been using a debian system as my household
firewall/router. It's been sitting quietly working without any major
changes, but has suddenly stopped doing so following my last aptitude
update/upgrade.

Server eth0 is connected to my modem, and eth1 is connected to internal
devices, using iptables to nat them and dnsmasq to provide internal
naming. The first symptom after upgrade was that ifconfig showed that
eth1 had no packets passing through (none transmitted, received or
dropped), although eth0 and the external internet connection worked
fine. I tried rebooting - no change. I tried restarting
/etc/init.d/networking, which caused the symptoms to reverse: now eth1
works, internal traffic is fine, but absolutely nothing is happening on
eth0. It's now stuck like this and I haven't been able to get eth0 to
work again whatever I do.

ifconfig shows eth0 is configured correctly (ip address, netmask, etc)
and route shows the gateway is ok. dmesg doesn't show any obvious
problems. But there are no packages moving through eth0 at all. Since I
initially had this symptom with eth1, which now works, I guess hardware
problems are ruled out.

This is Debian 8.2, uname says 3.16.7-ckt11-1+deb8u5 (2015-10-09)

My /etc/networks/interface goes;
#------------------------------------
auto eth0
iface eth0 inet static
....

auto eth1
iface eth1 inet static
....

auto dsl-provider
iface dsl-provider inet ppp
pre-up /sbin/ifconfig eth0 up
provider dsl-provider
#------------------------------------

I'd made no changes at all to any configuration files before this setup
stopped working, and it had previously worked unchanged for a long time.

Any suggestions?

Thanks
Graham

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#160175

On Tue, 3 Nov 2015 12:49:44 +0000
Graham Seaman <navtis@yahoo.co.uk> wrote:

> For some years I've been using a debian system as my household
> firewall/router. It's been sitting quietly working without any major
> changes, but has suddenly stopped doing so following my last aptitude
> update/upgrade.
<snip> 
> Any suggestions?

Why not use a dedicated firewall distribution, like IPCop ?
 
Cheers,
 
Ron.
-- 
                           It takes a smart husband
                    to have the last word and not use it.
                                    
                   -- http://www.olgiati-in-paraguay.org --
 

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#160180

On 03/11/15 15:15, Renaud (Ron) OLGIATI wrote:
> On Tue, 3 Nov 2015 12:49:44 +0000
> Graham Seaman <navtis@yahoo.co.uk> wrote:
>
>> For some years I've been using a debian system as my household
>> firewall/router. It's been sitting quietly working without any major
>> changes, but has suddenly stopped doing so following my last aptitude
>> update/upgrade.
> <snip> 
>> Any suggestions?
> Why not use a dedicated firewall distribution, like IPCop ?
The same machine also acts as my mail server, backup manager, etc.
Because of that I'm fairly desperate to get it back up as soon as
possible (all my real mail is currently bouncing while I'm stuck on
yahoo-mail).

There's also a more general kind of philosophical point: I started using
Linux because I hated the approach that says 'software is too complex
for normal people; if software fails, throw your device away and get a
new one'. In practice over  time my understanding of it has got less,
not more - I've been completely left behind since the start of systemd,
which I suspect may have something to do with my current problems. All
the same, I still feel that with some help everything ought to be fixable.

Graham


>  
> Cheers,
>  
> Ron.

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#160232

This turned out to be a hardware problem after all - short in an
ethernet cable. Though I don't understand how I got quite the symptoms I
did, it has now all been working for a couple of days so I guess that
was it.

Graham

On 03/11/15 15:33, Graham Seaman wrote:
> On 03/11/15 15:15, Renaud (Ron) OLGIATI wrote:
>> On Tue, 3 Nov 2015 12:49:44 +0000
>> Graham Seaman <navtis@yahoo.co.uk> wrote:
>>
>>> For some years I've been using a debian system as my household
>>> firewall/router. It's been sitting quietly working without any major
>>> changes, but has suddenly stopped doing so following my last aptitude
>>> update/upgrade.
>> <snip> 
>>> Any suggestions?
>> Why not use a dedicated firewall distribution, like IPCop ?
> The same machine also acts as my mail server, backup manager, etc.
> Because of that I'm fairly desperate to get it back up as soon as
> possible (all my real mail is currently bouncing while I'm stuck on
> yahoo-mail).
>
> There's also a more general kind of philosophical point: I started using
> Linux because I hated the approach that says 'software is too complex
> for normal people; if software fails, throw your device away and get a
> new one'. In practice over  time my understanding of it has got less,
> not more - I've been completely left behind since the start of systemd,
> which I suspect may have something to do with my current problems. All
> the same, I still feel that with some help everything ought to be fixable.
>
> Graham
>
>
>>  
>> Cheers,
>>  
>> Ron.

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