CentOS - Apr 2015 - Access Problem after update to CentOS 7.1

On 04/09/2015 03:50 PM, Gregory P. Ennis wrote:
> I am still having difficulty with this problem.
# ip addr show

# ip route show

# iptables -L -n -v

# tcpdump -nn -i <your primary interface> host <ip.ad.dr.es>

Watch tcpdump's output and try to connect from the IP address you name 
on the command line.  Don't ssh to that host and then back, or tcpdump 
will show you your outbound session.  Connect to the remote host from 
some other system.

Tail /var/log/messages and /var/log/secure while you connect.

On Thu, 2015-04-09 at 17:02 -0700, Gordon Messmer wrote:
> On 04/09/2015 03:50 PM, Gregory P. Ennis wrote:
> > I am still having difficulty with this problem.
> 
> # ip addr show
> 
> # ip route show
> 
> # iptables -L -n -v
> 
> # tcpdump -nn -i <your primary interface> host <ip.ad.dr.es>
> 
> Watch tcpdump's output and try to connect from the IP address you name 
> on the command line.  Don't ssh to that host and then back, or tcpdump 
> will show you your outbound session.  Connect to the remote host from 
> some other system.
> 
> Tail /var/log/messages and /var/log/secure while you connect.
> _______________________________________________
Gordon,

Thank you .... will do some experimenting!!!!

Greg

On Thu, 2015-04-09 at 21:50 -0500, Gregory P. Ennis
wrote:
> On Thu, 2015-04-09 at 17:02 -0700, Gordon Messmer wrote:
> > On 04/09/2015 03:50 PM, Gregory P. Ennis wrote:
> > > I am still having difficulty with this problem.
> > 
> > # ip addr show
> > 
> > # ip route show
> > 
> > # iptables -L -n -v
> > 
> > # tcpdump -nn -i <your primary interface> host
<ip.ad.dr.es>
> > 
> > Watch tcpdump's output and try to connect from the IP address you
name
> > on the command line.  Don't ssh to that host and then back, or
tcpdump
> > will show you your outbound session.  Connect to the remote host from 
> > some other system.
> > 
> > Tail /var/log/messages and /var/log/secure while you connect.
> > _______________________________________________
> 
> Gordon,
> 
> Thank you .... will do some experimenting!!!!
> 
> Greg
> 
> _______________________________________________
Gordon,

Thank you very much, the tool you gave me allowed me to see a problem
related to having two ethernet cards on the mail server.  I am not sure
what the problem is right now, but turning off one of the cards and
routing everything through the remaining card fixed the problem.
Interesting thing is that this was not a problem for 7.0, but only
appeared after the 7.1 upgrade.

I am going to let the mail flow for awhile before I try to figure out
what is happening.

Thank you again for your help!!!!!

Greg