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Red Hat Linux 7.1

By HighOrbit ·
I have a running problem with Red Hat Linux 7.1 (downloaded from ftp.redhat.com).

The system has been built as a DNS server, and runs very little... samba, bind, X etc..

It is impossible to access any service on this machine over the network. Although the server can be pinged. Telnet is enables yet refuses connections.

If running TCPDump while doing this I can see an error: udp port domain unreachable; but nothing else.

The system has been patched with all available security and system patches on redhat.

Installing Redhat 7.0 on this system works, but produces errors with BIND and a complete lack of a working backspace character (mild annoyances)!

While 7.0 is still an option 7.1 is preferable because of some updates to XFree86 and parts of the kernal.

Any help would be appreciated!

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Red Hat Linux 7.1

by schannachie In reply to Red Hat Linux 7.1

Hi,

To start with, let me point out some tasks that could help your diagnostic, and work this problem out. So,

1.- ps -el |grep xxxx (command)

xxxx :-> this stands for the named DNS daemon that may have a PID process id and has to be running.

xxxx :-> bind . So you will see if the bind daemon is running.

If both are running the trouble might be at the configuration files. To solve this you can do :

1.- Corrctions with linuxconf program to check out and correct the linux configuration at the basic configuration option, and at the server tasks option.

2.- Correction with an text editor (vi, mc, etc) at the configuration files at /etc. The files that mostly need some kind of setting are:

/etc/inetd.conf -->internet services config files
/etc/syslogd.conf --> System loging files
/etc/hosts --> Host name resolutions file
/etc/resolv.conf --> Name server resolutions file
/etc/hosts.equiv --> Equivalent host names
/etc/hosts.deny --> Deny host access
/etc/routed.conf --> Route daemos config file

3.- If you are sure that the dns and bind are OK then try the nslookup command to see if the dns and named are working properly. See man nslookup for detalis. The primary zone isconfigured using the linuxconf command utilitys. The nslookup flags could be for i.e.

nslookup -t server_ip_or_servername

First point the nslookup to the linux box you are configuring, and then to a dns server in your internal network so you can see it's records.

To check the bind daemon use the bind flags. for detailed info man bind. An example of the falgs you might use: bind -l


Hope it helps

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Red Hat Linux 7.1

by HighOrbit In reply to Red Hat Linux 7.1

Unfortunately this doesn't help. The zone files are all there and correct. There are no pertinent entries in any of the system logs.

The problem comes when trying to access the servers services over the network, whether it is Samba, telnet, http,or DNS.

It could be a problem with the version I have, but there is no documentation or error reports for this.

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Red Hat Linux 7.1

by taminato In reply to Red Hat Linux 7.1

You said:
>The problem comes when trying to access the servers services over the network, whether it is Samba, telnet, http, or DNS.

Answer:
Did you know that Redhat's default security setting is medium. This because means the lokkit util wasused to enable ipchains firewall and disable all network access, unless you coming in from lo.

1. Try flushing your ipchains rules by issue /ipchains -F. (Be careful if you really care about this system, there is a reason why Redhat defaults tomedium security.)

Good luck
Taminator

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Red Hat Linux 7.1

by HighOrbit In reply to Red Hat Linux 7.1

Tried that last time, but it appears it didn't give me the full list...

Works now I looked a little closer... thanks for that. I think I'll have to remember that little ipchains -L in future!

:-)

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Red Hat Linux 7.1

by HighOrbit In reply to Red Hat Linux 7.1

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