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Re: SSH Access Issue

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On 03/26/2017 08:30 AM, Cindy-Sue Causey wrote:
>
>> In the case I'm thinking, it's about manually adding multiple lines to
>> a file that I'm not completely remembering just now. Gut is saying
>> it's /etc/network/interfaces. Mine's almost empty so I don't have an
>> example to confirm that.
Typically user's put a second gateway option in the /etc/network/interface file (which you talk about in the next paragraph). This usually results in not understanding what the gateway does.
>>
>> What I encountered wasn't about declaring different values for
>> gateway, either. For whatever reasons due to innate [functionality],
>> it becomes a fail even if you declare the same gateway value for that
>> line within each new, separate block of declarations. Success is found
>> by declaring it once then omitting that line within any other new
>> blocks added over time.
While I've never put duplicate gateway information in /etc/network/interfaces I, at one point when learning about networking and setting it up in Debian, had put a gateway for each subnet in the interfaces file (which is incorrect and resulted in an error). A gateway, often called a "gateway of last resort" tells the system how to reach subnets that it is not attached to. That is the point of the gateway; it is the one place the system can send packets to when it doesn't know where to go. If you defined two gateways (meaning if this was allowed) you would be back to square one, the system wouldn't know which gateway to send the packet to. Defining two gateways could be an incorrect way of saying you are defining two routes (most likely static routes).
>>
>> Between my setup and cognition, I've never had anything stable enough
>> to test if it matters which block that gateway is declared. I've
>> wondered if it matters that it be in the first block, or if it just
>> needs to show up somewhere in that file. I was consciously putting it
>> in the first block because that seemed to be the *logical* thing to do
>> k/t having touched on programming 20 years ago at a local tech school.
I hadn't really thought about this myself. I've always defined the gateway under the interface that is attached to the subnet where the gateway resides. A.K.A. if I have two networks:

     auto eth0
     iface inet eth0 static
       address 192.168.0.2/24

     auto eth1
     iface inet eth1 static
       address 10.1.10.2/24

And my gateway of last resort was on the 192.168.0 subnet then I would define the gateway under that interface

     auto eth0
     iface inet eth0 static
       address 192.168.0.2/24
       gateway 192.168.0.1

It never occurred to me to see if it could be put anywhere in the file. My hunch is it can and I guess I could take the 60 seconds to test it, but I'll leave that to more adventurous people.

Thanks,
Joshua Schaeffer

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SSH Access Issue Philippe LeCavalier <support@plecavalier.com> - 2017-03-25 18:40 +0100
  Re: SSH Access Issue David Christensen <dpchrist@holgerdanske.com> - 2017-03-25 19:10 +0100
  Re: SSH Access Issue Nate Bargmann <n0nb@n0nb.us> - 2017-03-25 19:10 +0100
    Re: SSH Access Issue Philippe LeCavalier <support@plecavalier.com> - 2017-03-25 20:00 +0100
      Re: SSH Access Issue Philippe LeCavalier <support@plecavalier.com> - 2017-03-25 20:00 +0100
        Re: SSH Access Issue <tomas@tuxteam.de> - 2017-03-25 23:00 +0100
          Re: SSH Access Issue Philippe LeCavalier <support@plecavalier.com> - 2017-03-26 14:30 +0200
            Re: SSH Access Issue Cindy-Sue Causey <butterflybytes@gmail.com> - 2017-03-26 16:30 +0200
              Re: SSH Access Issue Cindy-Sue Causey <butterflybytes@gmail.com> - 2017-03-26 16:40 +0200
                Re: SSH Access Issue Joshua Schaeffer <jschaeffer0922@gmail.com> - 2017-03-27 00:10 +0200
                Re: SSH Access Issue Philippe LeCavalier <support@plecavalier.com> - 2017-03-27 03:10 +0200
            Re: SSH Access Issue David Christensen <dpchrist@holgerdanske.com> - 2017-03-26 21:10 +0200

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