hello,
This is in continuation of my network set up problem .
Since I had no alternative except to look at the TCP stack itself
....
I decided to try FreeBSD on my 486.
I installed FreeBSD and it works .I can now telnet and ftp .....
The Pentium still has linux installed and is configured as the name
server ....
I had the system running in less than 1 hour .....
So this means there is no hardware problem in my 486 .......
Then what is the problem .... ............. please help me .........
I myself want to look at the stack on linux .....
Can anyone tell me what's the best way to look at kernel data
structures .................
bye
ramc
"Ramachandran.A" wrote:
> hello,
> This is in continuation of my network set up problem ....
> I recompiled the kernel on both m/c's with firewall and statistics
> disabled ....
> It does not work even then ....
>
> So I decided to analyze tcpdump .....
> I wrote a small tcp server and client which just connect to each
> other .....(server.c,client.c) ....
> When i run the client on the same m/c as the server ... they
> connect ....
>
> ----------- coax cable
> ------------
> 192.168.1.1 <------------------>
> 192.168.1.5
>
> ----------- ------------
>
> Pentium 486(8mb ram)
> name-server
>
> When I run the client on the other m/c (taking care of server host
> address and server port ...) , they don;t
> connect .....
>
> When I looked at the tcpdump o/p I found
> - When the server runs on the pentium , the server is
> replying to the client's connect request with an ack (seq # properly updated
> by 1) ..
> But the client is not replying back .....the server
> repeatedly tries before timing out .....
>
> - When the server runs on the 486 ... it does not ack the
> connect request from the client ......
>
> So what is the problem here ....keeping in mind that ping is working
> , nameserver quries from the 486 to the pentium get answered properly
> Both m/c's have redhat 5.2(2.0.36) from the same cd .... :-(
>
> Where do I go from here ......
>
> Note : any mistakes in my description of /etc/ files in earlier mails
> are just typos ...
>
> ramc
>
> "Ramachandran.A" wrote:
>
> > hello all,
> >
> > This is in reference to my problem of not being able to do
> > telnet,ftp .(two redhat 5.2 m.cs , one is a 486dx2 , second 686)
> > Both are connected by a single lan cable ...(no hub)
> >
> > I will stress again that the following files are ok as
> > per NET3-HOWTO.
> > - /etc/inetd.conf (tcpd,telnetd .... uncommented)
> >
> > - /etc/services (all services uncommented)
> > - /etc/host
> > - /etc/host.conf (order host,multi ..... )
> > - /etc/host.allow
> > - /etc/host.deny
> > - /etc/nsswitch.conf
> > - /etc/protocols
> > - dns files are ok , name server is running
> > properly
> >
> > - the routing table has an entry for the network
> > (192.168.1.0) through eth0 (on both m/c's)
> > - inetd is running on both machines .
> > - i am able to do local telnet on each machine
> > - one m/c is 192.168.1.1 and other 192.168.1.5
> > (mask 255.255.255.0)
> > - m/c's ping each other
> > - tcpdump shows exchange of messages when i
> > initiate telnet/ftp from one m/c to another
> > - finally ftp/telnet timeout
> >
> > I ran inetd in debug mode . When i do telnet from
> > second m/c , inetd reports the attempt after a delay (app 1 min)
> > whereas it reports local attempts immediately .
> >
> > Then i decided to see the messages exchanged .
> > But tcpdump says operation not permitted when i use
> > the -s option to get say 100 bytes from each packet ....
> > How do i tackle this ......
> >
> > I don;t know what i am missing .
> >
> > I would be really greatful if somebody points out
> > where i am goofing up .....
> >
> > bye ....
> >
> > > hello,
> > > I am trying to connect two linux boxes in a private lan .
> > > Both boxes are running redhat 5.2 .
> > > The boxes are able to ping each other but are not able to do telnet
> >
> > > ,ftp
> > > I have followed all the instructions in NET3-HOWTO.
> > > I have configured one of the boxes as a name server .This is
> > working
> > > properly .
> > > nslookup is working properly on both machines .
> > > ftp and telnet timeout.
> >
> > -
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>
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