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On 13 April 2011 20:52, deadeyes <gvm999@×××××.com> wrote: |
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> Mick <michaelkintzios <at> gmail.com> writes: |
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>> Whether you set NIC priority in the /etc/conf.d/net file or in a post |
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>> up script, the result is the same. One NIC will have a higher |
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>> priority than another for ALL connections. This is because NICs do |
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>> not do NATing. They will send all packets out to the gateway |
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>> (192.168.1.1) and the router at the gateway will determine which |
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>> packet is forwarded to the Internet and which to the LAN. So, if you |
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>> do not want to prioritise one NIC over another, it may be better to |
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>> use iptables to route LAN packets via a particular NIC instead. |
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>> |
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> |
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> Great to see this helps someone else as well :) |
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> |
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> @Mick: I am not sure if I fully understand what you mean. Following the routing |
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> table the most specific route will be used, which is not the default route, but |
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> the route to the local lan. |
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*All* routes have to go through the local LAN. That's where you router is. |
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Both NICs are in the same subnet (192.168.1.0/24) and use the same |
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gateway (192.168.1.1). Therefore, the only thing that determines |
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which NIC your packets will go out of is the NIC's metric setting. |
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In your first email you show eth0 with a higher priority than wlan0. |
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All connections will go out eth0, unless eth0 goes down for some |
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reason, or becomes saturated. |
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> In this case the metric is important as there are |
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> multiple interfaces with the same network. |
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> And what do you mean by setting NIC priority (using the metric_eth0 config |
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> option?) using /etc/conf.d/net or in a post script? Both have different outcomes |
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> it looks to me. |
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Both have the same outcome - set priority for your eth0 and wlan0 NICs, |
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use the same file - /etc/conf.d/net |
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and set up the same parameter - metric. |
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The post up script also sets the lo interface to 0 which is the |
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default anyway. Unless I misunderstand the file's nomenclature local |
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stands for Local Loopback (127.0.0.1/255.0.0.0) and by default has |
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higher priority. |
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Anyway, that's how I understand this, no doubt some networking guru |
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will correct me if I got it wrong. |
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-- |
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Regards, |
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Mick |
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