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

[Jeff Blaine]

My final solution was to use OpenDHCP Server on the 2nd LAN card.  That 
is working fine with the RP getting addresses quickly.

Network load is about 250-375 Mbps on the RP-dedicated LAN, depending on 
the skim serv combo loaded at the moment.  And only a fraction on the 
port which shares the larger separate LAN.

No changes to the skim serve config was needed.

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

On 3/10/2023 1:29 PM, Jeff Blaine wrote:
>
> 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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