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Groups > comp.os.linux.networking > #4308 > unrolled thread

how set 2 network interface

Started byjonny <john@b.good>
First post2019-02-07 17:32 +0100
Last post2019-02-08 12:17 -0700
Articles 7 — 6 participants

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  how set 2 network interface jonny <john@b.good> - 2019-02-07 17:32 +0100
    Re: how set 2 network interface William Unruh <unruh@invalid.ca> - 2019-02-07 16:47 +0000
      Re: how set 2 network interface "Carlos E.R." <robin_listas@es.invalid> - 2019-02-08 11:41 +0100
    Re: how set 2 network interface Grant Taylor <gtaylor@tnetconsulting.net> - 2019-02-07 11:56 -0700
    Re: how set 2 network interface Marc Haber <mh+usenetspam1118@zugschl.us> - 2019-02-08 09:54 +0100
    Re: how set 2 network interface Chris Elvidge <chris@mshome.net> - 2019-02-08 11:21 +0000
      Re: how set 2 network interface Grant Taylor <gtaylor@tnetconsulting.net> - 2019-02-08 12:17 -0700

#4308 — how set 2 network interface

Fromjonny <john@b.good>
Date2019-02-07 17:32 +0100
Subjecthow set 2 network interface
Message-ID<q3hmir$s41$1@gioia.aioe.org>
Hello,

I have 2 network interface, eth0 and usb0.
I'm looking for set one for outgoing packet on the internet, and other 
to internal lan.

This is the network:

route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use 
Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    202    0        0 eth0
0.0.0.0         192.168.42.129  0.0.0.0         UG    204    0        0 usb0
192.168.1.0     0.0.0.0         255.255.255.0   U     202    0        0 eth0
192.168.42.0    0.0.0.0         255.255.255.0   U     204    0        0 usb0


I would set eth0 for internal lan, and usb0 as default route for internet.
I know I must use the route command, but I don't know exactly to do it.

Thanks

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#4309

FromWilliam Unruh <unruh@invalid.ca>
Date2019-02-07 16:47 +0000
Message-ID<q3hneb$qrr$1@dont-email.me>
In reply to#4308
On 2019-02-07, jonny <john@b.good> wrote:
>
> Hello,
>
> I have 2 network interface, eth0 and usb0.
> I'm looking for set one for outgoing packet on the internet, and other 
> to internal lan.
>
> This is the network:
>
> route -n
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use 
> Iface
> 0.0.0.0         192.168.1.1     0.0.0.0         UG    202    0        0 eth0
> 0.0.0.0         192.168.42.129  0.0.0.0         UG    204    0        0 usb0
> 192.168.1.0     0.0.0.0         255.255.255.0   U     202    0        0 eth0
> 192.168.42.0    0.0.0.0         255.255.255.0   U     204    0        0 usb0
 The computer will pick one or the other of eth0
or usb0 for the default. It will depend on which was set up last.
Both 192.168.1.0 and 192.168.42.0 are internal networks.
So you want to get rid of the first entry. And you want to set up your
system to set this up at boot, not you doing it by hand each time you
reboot. What OS do you have?
>
>
> I would set eth0 for internal lan, and usb0 as default route for internet.
> I know I must use the route command, but I don't know exactly to do it.

Have you tried reading
man route?

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#4312

From"Carlos E.R." <robin_listas@es.invalid>
Date2019-02-08 11:41 +0100
Message-ID<e030jf-f4c.ln1@Telcontar.valinor>
In reply to#4309
On 07/02/2019 17.47, William Unruh wrote:
> On 2019-02-07, jonny <john@b.good> wrote:
>>
>> Hello,
>>
>> I have 2 network interface, eth0 and usb0.
>> I'm looking for set one for outgoing packet on the internet, and other 
>> to internal lan.
>>
>> This is the network:
>>
>> route -n
>> Kernel IP routing table
>> Destination     Gateway         Genmask         Flags Metric Ref    Use 
>> Iface
>> 0.0.0.0         192.168.1.1     0.0.0.0         UG    202    0        0 eth0
>> 0.0.0.0         192.168.42.129  0.0.0.0         UG    204    0        0 usb0
>> 192.168.1.0     0.0.0.0         255.255.255.0   U     202    0        0 eth0
>> 192.168.42.0    0.0.0.0         255.255.255.0   U     204    0        0 usb0
>  The computer will pick one or the other of eth0
> or usb0 for the default. It will depend on which was set up last.

No, on metric.

-- 
Cheers, Carlos.

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#4310

FromGrant Taylor <gtaylor@tnetconsulting.net>
Date2019-02-07 11:56 -0700
Message-ID<q3hv51$av1$1@tncsrv09.home.tnetconsulting.net>
In reply to#4308
On 2/7/19 9:32 AM, jonny wrote:
> This is the network:
> 
> route -n
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use 
> Iface
> 0.0.0.0         192.168.1.1     0.0.0.0         UG    202    0        0 
> eth0
> 0.0.0.0         192.168.42.129  0.0.0.0         UG    204    0        0 
> usb0
> 192.168.1.0     0.0.0.0         255.255.255.0   U     202    0        0 
> eth0
> 192.168.42.0    0.0.0.0         255.255.255.0   U     204    0        0 
> usb0
> 
> I would set eth0 for internal lan, and usb0 as default route for internet.
> I know I must use the route command, but I don't know exactly to do it.

It looks like both eth0 and usb0 are likely DHCPing for their IP and 
gateway.

I'm also guessing that eth0 is connected at a faster speed than usb0.  I 
say this based on the metric.  (I'm thinking the difference in the 
metric may be speed related.)

You need to remove the route that is the default gateway from eth0.

ip route del 0.0.0.0 via 192.168.1.1

That should do it.

As William indicated, you'd likely not want to have to do this on every 
boot.  So, check to see if you can alter the network config for eth0 to 
not automatically add the default gateway, or do so with a higher metric 
so that the routing table will prefer the usb0 connected gateway.



-- 
Grant. . . .
unix || die

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#4311

FromMarc Haber <mh+usenetspam1118@zugschl.us>
Date2019-02-08 09:54 +0100
Message-ID<q3jg43$3c9$1@news1.tnib.de>
In reply to#4308
jonny <john@b.good> wrote:
>I'm looking for set one for outgoing packet on the internet, and other 
>to internal lan.
>
>This is the network:
>
>route -n
>Kernel IP routing table
>Destination     Gateway         Genmask         Flags Metric Ref    Use 
>Iface
>0.0.0.0         192.168.1.1     0.0.0.0         UG    202    0        0 eth0
>0.0.0.0         192.168.42.129  0.0.0.0         UG    204    0        0 usb0
>192.168.1.0     0.0.0.0         255.255.255.0   U     202    0        0 eth0
>192.168.42.0    0.0.0.0         255.255.255.0   U     204    0        0 usb0
>
>
>I would set eth0 for internal lan, and usb0 as default route for internet.

You should investigate where the wrong default route on eth0 comes
from. Something must set it to 192.168.1.1. Is 192.168.1.1 a router
that runs DHCP and wrongly thinks it has Internet?

Greetings
Marc
-- 
-------------------------------------- !! No courtesy copies, please !! -----
Marc Haber         |   " Questions are the         | Mailadresse im Header
Mannheim, Germany  |     Beginning of Wisdom "     | 
Nordisch by Nature | Lt. Worf, TNG "Rightful Heir" | Fon: *49 621 72739834

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#4313

FromChris Elvidge <chris@mshome.net>
Date2019-02-08 11:21 +0000
Message-ID<q3joo7$ogf$1@dont-email.me>
In reply to#4308
On 07/02/2019 16:32, jonny wrote:
> 
> Hello,
> 
> I have 2 network interface, eth0 and usb0.
> I'm looking for set one for outgoing packet on the internet, and other 
> to internal lan.
> 
> This is the network:
> 
> route -n
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use 
> Iface
> 0.0.0.0         192.168.1.1     0.0.0.0         UG    202    0        0 
> eth0
> 0.0.0.0         192.168.42.129  0.0.0.0         UG    204    0        0 
> usb0
> 192.168.1.0     0.0.0.0         255.255.255.0   U     202    0        0 
> eth0
> 192.168.42.0    0.0.0.0         255.255.255.0   U     204    0        0 
> usb0
> 
> 
> I would set eth0 for internal lan, and usb0 as default route for internet.
> I know I must use the route command, but I don't know exactly to do it.
> 
> Thanks

Unfortunately, route sometimes does not (reliably) remove a default route.

Are you using dhcpcd or dhclient or NetworkManager or static for eth0?

Are your interfaces defined in /etc/network/interfaces or /etc/dhcpcd.conf

do a 'ps ax | grep dhc'

if you see dhcpcd, add a line "nogateway" to your eth0 spec in dhcpcd.conf

if you see dhclient, add a line "metric 300" to the eth0 spec in 
interfaces if dhcp OR make sure there is no "gateway" line in he eth0 spec



-- 

Chris Elvidge, England

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#4314

FromGrant Taylor <gtaylor@tnetconsulting.net>
Date2019-02-08 12:17 -0700
Message-ID<q3kkp2$32e$1@tncsrv09.home.tnetconsulting.net>
In reply to#4313
On 2/8/19 4:21 AM, Chris Elvidge wrote:
> Unfortunately, route sometimes does not (reliably) remove a default route.

What are you talking about?

I've never had "route" or "ip -{4,6} route" not remove a route when I 
tell it to do so.

Are you talking about the fact that they will add a second default 
gateway without removing the existing one?  If so, I think that's 
intended behavior.



-- 
Grant. . . .
unix || die

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