[Skimmertalk] Moving a trio of RP over to a separate LAN - how to assign static fixed IP to the Red Pitaya

[Jeff Blaine]

Ha ha.  A quick look at the SD image and I noticed this config file is 
no where to be found.  So I assume that's part of the compiler options 
and is not something referred to at run time.

It will be easy enough to hang a little DHCP app off the PC to clear 
this issue though and that's my next option as my understanding of linix 
is slightly less than zero.  :)

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com

On 3/10/2023 11:56 AM, Jeff Blaine wrote:
>
> Thanks for the pointer Bob.
>
> You know far more about this sort of thing than I do but I did notice 
> in the notes that if DHCP requests fail, it's got a static IP fall 
> back to 192.168.1.100 and I think x.101.  I will have to test that out 
> but if that's the case, then it looks like all I have to do is to 
> patch the dhcpcd.conf lines 41 & 51 on two of the units and that will 
> give me static and unique IP on the 3 boxes.  And fortunately that 
> subnet x.1.x is unused in my network.
>
> Easy enough to try...
>
> 73/jeff/ac0c
> alpha-charlie-zero-charlie
> www.ac0c.com
> On 3/10/2023 1:07 AM, Bob Wilson, N6TV wrote:
>> The method for assigning a fixed IP address to the RP is documented 
>> somewhat tersely here, under "Network Configuration".
>>
>> http://pavel-demin.github.io/red-pitaya-notes/alpine/
>>
>> You'll have to get into the weeds and edit  /etc/dhcpcd.conf as 
>> explained in the referenced link.
>>
>> But, if you're using the RP-16, it requests /two/ IP addresses with a 
>> "phoney" Mac address (FF substituted for 2nd to last byte) for the 
>> second 8-slice receiver, using this command in start.sh:
>>
>> ip link add mvl0 link eth0 address $address type macvlan mode passthru
>>
>> I don't know if that command works with fixed IP addresses; it 
>> probably requires a real DHCP server.
>>
>> In sum, I don't think trying to make all that work is worth the effort.
>>
>> 73,
>> Bob, N6TV
>>
>>
>> On Thu, Mar 9, 2023 at 10:04 PM Jeff Blaine <KeepWalking188 at ac0c.com> 
>> wrote:
>>
>>     My key question is how to assign a static IP to the RP Skimmer
>>     receiver?
>>
>>     The background is this...
>>
>>     I have 3 RP now and in a busy contest condition, the combined
>>     network
>>     utilization of the 1G link is pretty significant.  Not nearly the
>>     point
>>     where it swamps the network, but it's easily 30-50% of network
>>     capacity
>>     in these conditions.
>>
>>     The computer I use for the skim server host has 2 LAN cards built
>>     into
>>     the motherboard.  So I'm thinking that I could probably hang the
>>     3 RP
>>     and a switch off of the 2nd LAN port which would isolate all that
>>     Skimmer chatter to the 2nd LAN port and keep it all from my primary
>>     LAN.  As all the skimmer apps (as well as HSSDR) run on that
>>     computer
>>     and no where else in the shack, I won't need to bridge the two
>>     Ethernet
>>     connections on the motherboard.
>>
>>     There is no gateway bound traffic and I don't want to hang a
>>     router off
>>     this mini-network just to provide DHCP so I'm thinking that I
>>     probably
>>     could make this work cleanly if I can figure out how to assign the 3
>>     individual RP with static fixed IP.
>>
>>     Appreciate any advice there.  And if any other of you fine
>>     fellows may
>>     have been there, done that as well.
>>
>>     -- 
>>     73/jeff/ac0c
>>     alpha-charlie-zero-charlie
>>     www.ac0c.com <http://www.ac0c.com>
>>
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>
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