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Static Routes On RedHat

By admin on July 6, 2006 in RedHat

Here’s the docs from redhat on how to setup static routes:

/etc/sysconfig/network-scripts/route-&lt;interface-namegt;

  Contains lines that specify additional routes that should be added when the
  associated interface is brought up.

  The files are processed by the ifup-routes script and uses the /sbin/ipcalc
  utility for all network masks and numbers. Routes are specified using the
  syntax:

    ADDRESSn=&lt;network&gt;
    NETMASKn=&lt;network/prefix mask&gt;
    GATEWAYn=&lt;next-hop router/gateway IP address&gt;

  The "n" can be any integer number, but is expected to be monotonically
  increasing and counting starts from 0. For example:

    ADDRESS0=192.168.2.0
    NETMASK0=255.255.255.0
    GATEWAY0=192.168.1.1

  adds a network route to the 192.168.2.0 network via the gateway at
  192.168.1.1. Since you must already have a route to the network of the
  gateway, there is no need to specify a device.

  Note: The ifup-routes script also supports an older syntax designed to be
  used directly as an argument to "/sbin/ip route add". This syntax is
  deprecated, but if no "ADDRESSn" lines are found the following will still
  work:

  192.168.2.0/24 dev ppp0

  adds a network route to the 192.168.2.0 network through ppp0.

/etc/sysconfig/network-scripts/route-<interface-namegt;

Contains lines that specify additional routes that should be added when the

associated interface is brought up.

The files are processed by the ifup-routes script and uses the /sbin/ipcalc

utility for all network masks and numbers. Routes are specified using the

syntax:

ADDRESSn=<network>

NETMASKn=<network/prefix mask>

GATEWAYn=<next-hop router/gateway IP address>

The "n" can be any integer number, but is expected to be monotonically

increasing and counting starts from 0. For example:

ADDRESS0=192.168.2.0

NETMASK0=255.255.255.0

GATEWAY0=192.168.1.1

adds a network route to the 192.168.2.0 network via the gateway at

192.168.1.1. Since you must already have a route to the network of the

gateway, there is no need to specify a device.

Note: The ifup-routes script also supports an older syntax designed to be

used directly as an argument to "/sbin/ip route add". This syntax is

deprecated, but if no "ADDRESSn" lines are found the following will still

work:

192.168.2.0/24 dev ppp0

adds a network route to the 192.168.2.0 network through ppp0.

Let’s say you want to add two static routes to eth1. The first routes 10.10.10.0/255.255.255.0 to 10.10.10.1 and the second routes traffic from 10.10.11.0/255.255.255.0 to 10.10.11.1. To accomplish this create a file at:

/etc/sysconfig/network-scripts/route-eth1

1	/etc/sysconfig/network-scripts/route-eth1

And place the following lines in the file:

    ADDRESS0=10.10.10.0
    NETMASK0=255.255.255.0
    GATEWAY0=10.10.10.1
    ADDRESS1=10.10.11.0
    NETMASK1=255.255.255.0
    GATEWAY1=10.10.11.1

ADDRESS0=10.10.10.0

NETMASK0=255.255.255.0

GATEWAY0=10.10.10.1

ADDRESS1=10.10.11.0

NETMASK1=255.255.255.0

GATEWAY1=10.10.11.1

Then restart networking with:

    /sbin/service network restart

1	/sbin/service network restart

Fixing ethernet interface speed

By admin on January 8, 2005 in Networking, RedHat

On redhat, the ETHTOOL_OPTS can provide some control over interface speed. Here’s the description from documentation:

ETHTOOL_OPTS=...
      Any device-specific options supported by ethtool. For example,
      if you wanted to force 100Mb full duplex:
        ETHTOOL_OPTS="speed 100 duplex full autoneg off"
      Note that changing speed or duplex settings almost always
      requires disabling autonegotiation with 'autoneg off'.

ETHTOOL_OPTS=...

Any device-specific options supported by ethtool. For example,

if you wanted to force 100Mb full duplex:

ETHTOOL_OPTS="speed 100 duplex full autoneg off"

Note that changing speed or duplex settings almost always

requires disabling autonegotiation with 'autoneg off'.

The ethtool utility provides extensive low level control over ethernet interfaces.

Redhat Network Config Resources

By admin on January 8, 2005 in Apache, Networking, RedHat

Here are some handy references about network config on redhat:

/usr/share/doc/initscripts-<version>/sysconfig.txt — A guide to available options for network configuration files, including IPv6 options not covered in this chapter.
/usr/share/doc/iproute-<version>/ip-cref.ps — This file contains a wealth of information about the ip command, which can be used to manipulate routing tables, among other things. Use the ggv or kghostview application to view this file.
http://www.redhat.com/docs/manuals/enterprise/RHEL-3-Manual/ref-guide/ch-networkscripts.html

Defining Alias Interfaces

By admin on January 8, 2005 in Networking, RedHat

RedHat supports the configuration of alias interfaces via network scripts of the for “

ifcfg-eth0:0

1	ifcfg-eth0:0

” as described in the documentation here:

http://www.redhat.com/docs/manuals/enterprise/RHEL-3-Manual/ref-guide/s1-networkscripts-interfaces.html

Additionally there is undocumented support for alias ranges. Using a single network script of the form “

ifcfg-eth0-range0

1	ifcfg-eth0-range0

” a set of alias interfaces can be defined. This if very handly when setting up several aliases on a web server.

Here’s a sample config file named “ifcfg-eth0-range0”:

DEVICE=eth0
BOOTPROTO=static
HWADDR=00:0C:F1:D7:BB:6F
ONBOOT=yes
TYPE=Ethernet
IPADDR_START=70.84.242.240
IPADDR_END=70.84.242.247
CLONENUM_START=240
NETMASK=255.255.255.255
NO_ALIASROUTING=yes

DEVICE=eth0

BOOTPROTO=static

HWADDR=00:0C:F1:D7:BB:6F

ONBOOT=yes

TYPE=Ethernet

IPADDR_START=70.84.242.240

IPADDR_END=70.84.242.247

CLONENUM_START=240

NETMASK=255.255.255.255

NO_ALIASROUTING=yes

Alias interfaces can be manually activated/deactivated with “

ifup eth0-range0

1	ifup eth0-range0

” or “

ifdown eth0-range0

1	ifdown eth0-range0

”.

Install Fix for Oracle 9i on RHEL 3

By admin on August 9, 2004 in Oracle, RedHat

I was getting weird jvm errors while running the installer. Fix is documented here:

http://www.redhat.com/archives/fedora-list/2003-November/msg06994.html

At

 ftp://people.redhat.com/drepper/libcwait.c

you find a file which you can compile with

  gcc -shared -o libcwait.so -fpic -O2 libcwait.c

to get a DSO which you then can preload with

  LD_PRELOAD=/path/to/libcwait.so java ARGS...

ftp://people.redhat.com/drepper/libcwait.c

you find a file which you can compile with

gcc -shared -o libcwait.so -fpic -O2 libcwait.c

to get a DSO which you then can preload with

LD_PRELOAD=/path/to/libcwait.so java ARGS...

Another problem involved the installer hanging at “Link pending …”. This was fixed with:

  export LD_ASSUME_KERNEL=2.2.5

1	export LD_ASSUME_KERNEL=2.2.5

Here a link to a discussion of this issue:

http://dbforums.com/t759429.html

And here’s a link to many more fixes:

http://www.puschitz.com/InstallingOracle9i.shtml

And another good link:

http://www.oracle-base.com/articles/9i/Oracle9iInstallationOnRedHatAS3.php

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