Experimental Physics and
Industrial Control System

Bruce Hill <[email protected]> · Tue, 17 May 2011 13:54:37 -0700

oops, yes I said that backwards, its typically broadcasts that are received
by all servers (on the same host), and unicasts that are received by only by
one of multiple servers (on the same host).

I'm running with defaults for the EPICS_CA* and EPICS_CAS* env
variables, but have also played with EPICS_CA_ADDR_LIST,
EPICS_CA_AUTO_ADDR_LIST, and EPICS_CA_INTF_ADDR_LIST with no success.

The IOC's server is not yet impacted by the EPICS_CA_INTF_ADDR_LIST
configuration.

I've been having trouble with one linux machine where my IOC's
appear to be running correctly, dbgf works from iocsh, but caget
from another window on the same machine fails to connect.

Sounds like a routing level issue. The output from "netstat -r" might be
interesting.

Jeff
Kernel IP routing table

Destination     Gateway         Genmask         Flags   MSS Window 
irtt Iface

192.168.254.0   0.0.0.0         255.255.255.0   U         0 0         
0 eth2

134.79.32.0     0.0.0.0         255.255.252.0   U         0 0         
0 eth0

169.254.0.0     0.0.0.0         255.255.0.0     U         0 0         
0 eth2

0.0.0.0         134.79.35.1     0.0.0.0         UG        0 0         
0 eth0

Mark suggested a firewall issue.   I'm looking into that now.   This

isn't our normal deployment system.   It's for an experimental chamber
that's

currently in a different building at SLAC that wanted to run the same
EPICS

motor control as they do when their chamber is installed in the
hutch.   That

machine is visible from the internet, and I don't administer it, so
I'll need

to find the sysadmin for this machine before making any changes.

This system, kernel 2.6.26.3-29.fc9.x86_64, does have a package called
system-config-firewall

installed that says the firewall is enabled.   iptables shows:

# /sbin/iptables -L

Chain INPUT (policy ACCEPT)

target     prot opt source               destination         

ACCEPT     all  --  anywhere             anywhere            state
RELATED,ESTABLISHED 

ACCEPT     icmp --  anywhere             anywhere            

ACCEPT     all  --  anywhere             anywhere            

ACCEPT     tcp  --  anywhere             anywhere            state NEW
tcp dpt:ssh 

ACCEPT     tcp  --  anywhere             anywhere            state NEW
tcp dpt:mysql 

REJECT     all  --  anywhere             anywhere           
reject-with icmp-host-prohibited 

Chain FORWARD (policy ACCEPT)

target     prot opt source               destination         

REJECT     all  --  anywhere             anywhere           
reject-with icmp-host-prohibited 

Chain OUTPUT (policy ACCEPT)

target     prot opt source               destination         

Thanks,

- Bruce

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System