Re: [CentOS] Wierd Networking Problem

2007-10-31 Thread Shawn Everett
> > Have you contacted "isp.net", whoever they are, to make sure that they > > have not blackholed or tarpitted that particular machine's IP address > > for some reason? > > He said that the box is behind a nat and only that box behind the nat > has a problem. I doubt that it has been specifically

Re: [CentOS] Wierd Networking Problem

2007-10-31 Thread Christopher Chan
Bart Schaefer wrote: On Oct 31, 2007 12:24 AM, Shawn Everett <[EMAIL PROTECTED]> wrote: telnet smtp.isp.net 25 generates the following: Trying a.b.c.d... Connected to smtp.isp.net. Escape character is '^]'. And then nothing. All other machines can connect to smtp.isp.net 25 without a problem.

Re: [CentOS] Wierd Networking Problem

2007-10-31 Thread Bart Schaefer
On Oct 31, 2007 12:24 AM, Shawn Everett <[EMAIL PROTECTED]> wrote: > > telnet smtp.isp.net 25 generates the following: > Trying a.b.c.d... > Connected to smtp.isp.net. > Escape character is '^]'. > > And then nothing. All other machines can connect to smtp.isp.net 25 > without a problem. They als

Re: [CentOS] Wierd Networking Problem

2007-10-31 Thread Shawn Everett
On Wednesday 31 October 2007, Alain Spineux wrote: > Did you tried to ping other host inside and outside your network, your > gateway ? If not working, did you tried to arping your gateway ? > Did you look for packet with "tcpdump -n -i eth0" ? > I can successfully traceroute from the server to g

Re: [CentOS] Wierd Networking Problem

2007-10-31 Thread Alain Spineux
Did you tried to ping other host inside and outside your network, your gateway ? If not working, did you tried to arping your gateway ? Did you look for packet with "tcpdump -n -i eth0" ? On 10/31/07, Shawn Everett <[EMAIL PROTECTED]> wrote: > Hi Guys, > > I'm 100% sure this is not a Linux issue

Re: [CentOS] Wierd Networking Problem

2007-10-30 Thread Christopher Chan
Shawn Everett wrote: Hi Guys, I'm 100% sure this is not a Linux issue but I want a second opinion... I have a Linux server running CentOS. It was been absolutely perfect without any errors or problems. Since Monday it has been unable to send email. It is configured to act as a smart host.

[CentOS] Wierd Networking Problem

2007-10-30 Thread Shawn Everett
Hi Guys, I'm 100% sure this is not a Linux issue but I want a second opinion... I have a Linux server running CentOS. It was been absolutely perfect without any errors or problems. Since Monday it has been unable to send email. It is configured to act as a smart host. All email gets forward