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Subject: Re: Default Gateway for a system v/s Default gateway per Interface
To: Ratan Gupta <ratagupt@linux.vnet.ibm.com>, wak@google.com,
 openbmc@lists.ozlabs.org
References: <fd2978a9-bd4b-a8ba-67ac-94a8537a9fcf@linux.vnet.ibm.com>
From: Johnathan Mantey <johnathanx.mantey@intel.com>
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Ratan,

In the email trail for this topic on 27 April you indicated you were
going to start work on the per NIC gateway.
What is the current state of implementing this feature?

On 4/24/20 8:06 AM, Ratan Gupta wrote:
> Hi All,
>
> Currently, OpenBMC stack allows a single default gateway for the
> system. Latest kernel allows to configure multiple default gateways.
>
> Eg: In a system with two interfaces eth0 and eth1,
>
> eth0 configured with static address and having gateway(192.168.2.1)
> eth1 configured with DHCP and gets Gateway from DHCP server (10.10.10.1=
)
> ~~~~~~~~~~~~~
> Kernel IP routing table
> Destination=C2=A0=C2=A0=C2=A0=C2=A0 Gateway=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 Genmask=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 Flags=C2=A0=C2=A0 MSS Window=C2=A0
> irtt Iface
> 0.0.0.0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 19.168.2.1=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 0.0.0.0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 UG=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0 0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
> 0 eth0
> 0.0.0.0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 10.10.10.1=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 0.0.0.0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 UG=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0 0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
> 0 eth1
> ~~~~~~~~~~~~~~
>
> Kernel will first try using the default gateway having higher metric
> value and then fall back to the lower.
>
> More references:
> https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/=
7/html/networking_guide/sec-configuring_the_default_gateway
>
> I'm proposing to make this change in the openBMC D-bus interfaces to
> tie the gateway property with the Ethernet interface schema instead of
> System configuration.
>
> Ethernet Interface Schema =3D>
>
> https://github.com/openbmc/phosphor-dbus-interfaces/blob/master/xyz/ope=
nbmc_project/Network/EthernetInterface.interface.yaml
>
>
> System Configuration Schema =3D>
>
> https://github.com/openbmc/phosphor-dbus-interfaces/blob/master/xyz/ope=
nbmc_project/Network/SystemConfiguration.interface.yaml
>
>
>
> Please let me know your suggestions.
>
> Regards
> Ratan Gupta
>

--=20
Johnathan Mantey
Senior Software Engineer
*azad te**chnology partners*
Contributing to Technology Innovation since 1992
Phone: (503) 712-6764
Email: johnathanx.mantey@intel.com <mailto:johnathanx.mantey@intel.com>


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-8">
  </head>
  <body>
    Ratan,<br>
    <br>
    In the email trail for this topic on 27 April you indicated you were
    going to start work on the per NIC gateway.<br>
    What is the current state of implementing this feature?<br>
    <br>
    <div class=3D"moz-cite-prefix">On 4/24/20 8:06 AM, Ratan Gupta wrote:=
<br>
    </div>
    <blockquote type=3D"cite"
      cite=3D"mid:fd2978a9-bd4b-a8ba-67ac-94a8537a9fcf@linux.vnet.ibm.com=
">Hi
      All,
      <br>
      <br>
      Currently, OpenBMC stack allows a single default gateway for the
      system. Latest kernel allows to configure multiple default
      gateways.
      <br>
      <br>
      Eg: In a system with two interfaces eth0 and eth1,
      <br>
      <br>
      eth0 configured with static address and having
      gateway(192.168.2.1)
      <br>
      eth1 configured with DHCP and gets Gateway from DHCP server
      (10.10.10.1)
      <br>
      ~~~~~~~~~~~~~
      <br>
      Kernel IP routing table
      <br>
      Destination=C2=A0=C2=A0=C2=A0=C2=A0 Gateway=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 Genmask=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 Flags=C2=A0=C2=A0 MSS
      Window=C2=A0 irtt Iface
      <br>
      0.0.0.0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 19.168.2.1=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 0.0.0.0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 UG=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0
      0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0 eth0
      <br>
      0.0.0.0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 10.10.10.1=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 0.0.0.0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 UG=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0
      0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0 eth1
      <br>
      ~~~~~~~~~~~~~~
      <br>
      <br>
      Kernel will first try using the default gateway having higher
      metric value and then fall back to the lower.
      <br>
      <br>
      More references:
<a class=3D"moz-txt-link-freetext" href=3D"https://access.redhat.com/docu=
mentation/en-us/red_hat_enterprise_linux/7/html/networking_guide/sec-conf=
iguring_the_default_gateway">https://access.redhat.com/documentation/en-u=
s/red_hat_enterprise_linux/7/html/networking_guide/sec-configuring_the_de=
fault_gateway</a><br>
      <br>
      I'm proposing to make this change in the openBMC D-bus interfaces
      to tie the gateway property with the Ethernet interface schema
      instead of System configuration.
      <br>
      <br>
      Ethernet Interface Schema =3D&gt;
      <br>
      <br>
<a class=3D"moz-txt-link-freetext" href=3D"https://github.com/openbmc/pho=
sphor-dbus-interfaces/blob/master/xyz/openbmc_project/Network/EthernetInt=
erface.interface.yaml">https://github.com/openbmc/phosphor-dbus-interface=
s/blob/master/xyz/openbmc_project/Network/EthernetInterface.interface.yam=
l</a>
      <br>
      <br>
      System Configuration Schema =3D&gt;
      <br>
      <br>
<a class=3D"moz-txt-link-freetext" href=3D"https://github.com/openbmc/pho=
sphor-dbus-interfaces/blob/master/xyz/openbmc_project/Network/SystemConfi=
guration.interface.yaml">https://github.com/openbmc/phosphor-dbus-interfa=
ces/blob/master/xyz/openbmc_project/Network/SystemConfiguration.interface=
=2Eyaml</a>
      <br>
      <br>
      <br>
      Please let me know your suggestions.
      <br>
      <br>
      Regards
      <br>
      Ratan Gupta
      <br>
      <br>
    </blockquote>
    <br>
    <div class=3D"moz-signature">-- <br>
      <meta http-equiv=3D"content-type" content=3D"text/html; charset=3DU=
TF-8">
      <title></title>
      <font color=3D"#1F497D"><font face=3D"Century Gothic">Johnathan Man=
tey<br>
          <small>Senior Software Engineer</small><br>
          <big><font color=3D"#555555"><small><b>azad te</b><b>chnology
                  partners</b></small><br>
              <small><font color=3D"#1F497D"><small>Contributing to
                    Technology Innovation since 1992</small></font><small=
><br>
                  <font color=3D"#1F497D">Phone: (503) 712-6764<br>
                    Email: <a href=3D"mailto:johnathanx.mantey@intel.com"=
>johnathanx.mantey@intel.com</a></font></small><br>
                <br>
              </small></font></big></font></font> </div>
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