Re: problem with gateway and softIoc running on same server

[Dirk Zimoch <dirk.zimoch@psi.ch>]

Hello Kevin,

When you run two or more CA servers (IOCs or gateways) on the same 
machine, you cannot reach all of them with the host ip address in 
EPICS_CA_ADDR_LIST. You can only reach all with the broadcast address.
Thats exactly what the warning that an IOC prints in this case is about:

cas warning: Configured TCP port was unavailable.
cas warning: Using dynamically assigned TCP port 38724,
cas warning: but now two or more servers share the same UDP port.
cas warning: Depending on your IP kernel this server may not be
cas warning: reachable with UDP unicast (a host's IP in EPICS_CA_ADDR_LIST)

However, it should work when using different ports for the IOC and the 
gateway server part. I tried it:
(on the same host)
export EPICS_CA_SERVER_PORT=8164
<start the ioc with ai record DZ-ai:ch1>
unset EPICS_CA_SERVER_PORT
gateway -cip 129.129.145.26:8164 -sip 129.129.145.26 -sport 5064
caget DZ-ai:ch1
DZ-ai:ch1                      0
Works.

gateway -cip localhost:8164 -sip 129.129.145.26 -sport 5064
Works too.

Maybe using localhost is the solution for you.

Also check the firewall settings.
sudo /sbin/iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

(No filtering here)



Best regards,
Dirk

Kevin Tsubota wrote:
> Hi,
>
>  
>
> I want a gateway to publish PVs from 192.168.134.51:8064 which is on a 
> private network connected to 192.171.95.112 (where a softIoc is already 
> running) because I can’t access this private
>  
>
> I have the situation where I have a solaris-8 server (192.171.95.112) 
> with two network cards.  One goes to our observatory network and the 
> other goes to a private network running a windows based softIoc 
> (192.168.134.51).  Now I need access to the PVs of the widows softIoc 
> from other IPs on the observatory network. 
>
>  
>
> I can successfully get the gateway to publish the windows softIoc PVs 
> without any problems.  However, I have a solaris softIoc running on the 
> same server as the gateway and this is where I’m having problems. I’ve 
> tried using different EPICS_CA_SERVER_PORTS for both IOCs but no matter 
> what I try I can’t get the gateway to see the solaris IOC on the same 
> IP.  If I manually set my EPICS_CA_SERVER_PORT at the command line then 
> issue a caget, it successfully returns the PV value but it reports that 
> there’s multiple instances of the PV.
>  
>
> My question is: can a gateway co-exist with a softIoc in the same ip 
> address?
> If so, what do I need to do to make it happen?  Using different 
> EPICS_CA_SERVER_PORTs doesn’t seem to be it.  Is this related to the 
> fact that I can’t run multiple softIocs on the same server unless I 
> change port numbers?  In which case I’d want a gateway to interface to 
> them as well.
>  
>
> Here’s my startup command run on the solaris server (128.171.95.112):
>
> /usr/local/epics/r3.14.9/extensions/bin/solaris-sparc-gnu/gateway -debug 
> 1 -pvlist k1lmct.pvlist -access GATEWAY.access -home $HOME -log 
> k1lmct.log -sip "128.171.95.112" -sport 5064 -cip "192.171.95.112:8164 
> 192.168.134.51:8064" -prefix k1:lmct:gateway&
>  
>
> Here’s the start of the debug output log:
>
> PV Gateway Version 2.0.3.0 [Feb 20 2008 16:27:23]
>
> EPICS 3.14.9 PID=13539
>
> EPICS_CA_ADDR_LIST=192.171.95.112:8164 192.168.134.51:8064
>
> EPICS_CA_AUTO_ADDR_LIST=NO
>
> EPICS_CA_SERVER_PORT=Not specified
>
> EPICS_CA_MAX_ARRAY_BYTES=Not specified
>
> EPICS_CAS_INTF_ADDR_LIST=128.171.95.112
>
> EPICS_CAS_SERVER_PORT=5064
>
> EPICS_CAS_IGNORE_ADDR_LIST=Not specified
>
>  
>
> Thank you in advance!
>
>  
>
> Kevin Tsubota
>
> W.M. Keck Observatory
>
>