[brlug-general] how to permanently save default gw

[Dustin Puryear]

Good point!

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Tim Fournet wrote:
> Also note that updating your routing table manually via a boot script 
> will only work temporarily - When the DHCP client renews its IP address 
> - which typically happens every 1-24 hours, depending on your server's 
> configuration - it will override the default gateway again. Your best 
> bet is to either modify your dhclient as described below, or go 
> static-either with a dhcp reservation or manually entered IP address.
> 
> Tim Fournet wrote:
>> If your goal is to have your DHCP client not use the default gateway 
>> that the DHCP server gives you, you can override this by creating an 
>> /etc/dhclient.conf file and place a line in that file that reads 
>> something like:
>>
>>      supersede routers "my.default.route.ip" ;
>>
>> You can "man dhclient.conf" for more info and a full sample to start 
>> from. Another option would be to give your host a static reservation in 
>> the DHCP server, and have that reservation not give out a default route.
>>
>> -Tim
>>
>>
>>
>> Dustin Puryear wrote:
>>   
>>> Since your internal interface is doing DHCP, you can't do this without 
>>> making a choice:
>>>
>>> 1. Don't do DHCP on your internal face, define static IPs for both 
>>> internal and external, and only define your gateway for your external 
>>> (via netconfig or by hand-editing 
>>> /etc/sysconfig/networks-scripts/ifcfg-eth[0,1].
>>>
>>> 2. Update your /etc/rc.d/rc.local script to adjust your routing table as 
>>> necessary.
>>>
>>> The issue here is that you are using DHCP, nothing else. It's going to 
>>> setup your default route. You need to address that one way or the other.
>>>
>>> Oh, and David's example doesn't appear to be RHEL to me. I've never seen 
>>>   an /etc/init.d/myroute on Red Hat or Red Hat-like systems. I could be 
>>> wrong about this though. Update us.
>>>
>>> --
>>> Puryear Information Technology, LLC
>>> Baton Rouge, LA * 225-706-8414
>>> http://www.puryear-it.com
>>>
>>> Author:
>>>    "Best Practices for Managing Linux and UNIX Servers"
>>>    "Spam Fighting and Email Security in the 21st Century"
>>>
>>> Download your free copies:
>>>    http://www.puryear-it.com/publications.htm
>>>
>>> Petri Laihonen wrote:
>>>   
>>>     
>>>> Distro I'm using is RHEL4.x
>>>>
>>>> Petri
>>>>
>>>>
>>>> willhill wrote:
>>>>     
>>>>       
>>>>> The easy solution is to swap the wires.  Other solutions depend on what 
>>>>> distribution you are using.  
>>>>>
>>>>> On Sunday 29 April 2007 1:09 pm, Petri Laihonen wrote:
>>>>>   
>>>>>       
>>>>>         
>>>>>> How would I save default gateway setting?
>>>>>>
>>>>>> I have 2 network interfaces eth0 and eth1 respectfully.
>>>>>>
>>>>>> eth0 is the outside network connection with static IP
>>>>>> eth1 is the internal connection getting IP from DHCP (and apparently
>>>>>> route as well)
>>>>>>
>>>>>> For some reason the default gateway is been set to the eth1 using the
>>>>>> route out from internal network. This prevent me from connecting to the
>>>>>> server using outside network connection. (None of the services respond
>>>>>> to connection attempts, except from internal network) ... 
>>>>>>     
>>>>>>         
>>>>>>           
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>>>>>   
>>>>>       
>>>>>         
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