Slackware 9.1- secondary IP problem

Hello,

I have a Slackware server setup with the following running sendmail &
bind:

ifconfig eth0 172.16.0.1
ifconfig eth0:0 192.168.0.1

I have a PC (IP 192.168.0.10) connected directly to this box.

The PC and ping the server on 192.168.0.1 no problems. But when I try
to telnet to port 25 the SMTP mailer header takes around 20 seconds to
appear. When I change the IP address of the PC to 172.16.0.10 the SMTP
mailing header appears straight away.

I changed eth0:0 to 172.16.0.2 and could telnet to port 25 using both
172.16.0.1 and 172.16.0.2 and the header appears straight away. It
appears only to be a problem when eth0:0 is configured on a different
subnet to eth0.

Any ideas? Thanks.

Matt <(E-Mail Removed)> wrote:
> ifconfig eth0 172.16.0.1
> ifconfig eth0:0 192.168.0.1

AFAIK the first 'alias' for every Nic is 1, not 0.

> to telnet to port 25 the SMTP mailer header takes around 20 seconds to
> appear. When I change the IP address of the PC to 172.16.0.10 the SMTP
> mailing header appears straight away.

Probably because of name resolutions, check your routing and DNS
configuration.

> I changed eth0:0 to 172.16.0.2 and could telnet to port 25 using both
> 172.16.0.1

That's because the packets are sent to the same interface.

Davide

--
| A copy of the universe is not what is required of art; one of the
| damned things is ample. -- Rebecca West
|
|

Matt wrote:
> Hello,
>
> I have a Slackware server setup with the following running sendmail &
> bind:
>
> ifconfig eth0 172.16.0.1
> ifconfig eth0:0 192.168.0.1
>
> I have a PC (IP 192.168.0.10) connected directly to this box.
>
> The PC and ping the server on 192.168.0.1 no problems. But when I try
> to telnet to port 25 the SMTP mailer header takes around 20 seconds to
> appear. When I change the IP address of the PC to 172.16.0.10 the SMTP
> mailing header appears straight away.
>
> I changed eth0:0 to 172.16.0.2 and could telnet to port 25 using both
> 172.16.0.1 and 172.16.0.2 and the header appears straight away. It
> appears only to be a problem when eth0:0 is configured on a different
> subnet to eth0.
>
> Any ideas? Thanks.

Try changing eth0:0 to eth0:1. AFAIK, eth0:0 won't work. And, check your
DNS configuration.

regards,
GVK

Thanks guys - DNS problem, don't worry I've already kicked myself for
missing that one.


GVK <(E-Mail Removed)> wrote in message news:<cbbnco$r8u$(E-Mail Removed)>...
> Matt wrote:
> > Hello,
> >
> > I have a Slackware server setup with the following running sendmail &
> > bind:
> >
> > ifconfig eth0 172.16.0.1
> > ifconfig eth0:0 192.168.0.1
> >
> > I have a PC (IP 192.168.0.10) connected directly to this box.
> >
> > The PC and ping the server on 192.168.0.1 no problems. But when I try
> > to telnet to port 25 the SMTP mailer header takes around 20 seconds to
> > appear. When I change the IP address of the PC to 172.16.0.10 the SMTP
> > mailing header appears straight away.
> >
> > I changed eth0:0 to 172.16.0.2 and could telnet to port 25 using both
> > 172.16.0.1 and 172.16.0.2 and the header appears straight away. It
> > appears only to be a problem when eth0:0 is configured on a different
> > subnet to eth0.
> >
> > Any ideas? Thanks.
>
> Try changing eth0:0 to eth0:1. AFAIK, eth0:0 won't work. And, check your
> DNS configuration.
>
> regards,
> GVK