[NTLUG:Discuss] if you can stand any more on dhcpcd

[Val W. Harris]

Fred James wrote:
> Please understand that all other machines on my LAN are doing fine and 
> reaching any network they need to (ATT and VPN)
> It is only my laptop that cannot - so the network is OK, just the laptop 
> not getting a good IP
> 
> When I have the problem, the laptop cannot get to anything - LAN or WAN 
> - cannot get to my other local computers, or printers, cannot get to 
> ATT, cannot get to VPN.
> 
> Repeating an earlier message, what I did to fix it this evening was the 
> following two commands, as root, in a terminal window on the laptop:
>   dhcpcd -k eth0
>   dhcpcd -n -H eth0
> and then all was right and running smooth again.
> 
> 
> Val W. Harris wrote:
> 
>> Fred James wrote:
>>
>>> ANG1105  is DHCP server at home
>>> Windows2000 machine is DHCP server at work
>>> Subnet Mask is 255.255.255.0 at both locations
>>> Do I personally control the DHCP server at either end - no.  I used 
>>> to use a Linksys at home, and I controlled that, but the corporation 
>>> owns and controls the ANG1105
>>>
>>> The ANG1105 does two things - if the request is addressing something 
>>> on the VAN, it routes through the VAN; if the address is something 
>>> outside the VAN, it routes to my ISP (ATT.).
>>> I have verified that by visiting sites that would be restricted 
>>> within the corporate Intranet.
>>>
>>
>> When you have the problem, that requires a new IP lease to fix, can you
>> get to the AT&T internet, but not your corporate LAN; or do both
>> destinations come up "Network Unreachable"?
>>
>> Val
> 
> 
> 

Fred,

Without further exploration, my guess would be that the ANG1105 home
DHCP server will not renew a lease from the Windows2000 work DHCP
server.  Without a renewal, you laptop "gives up" network-wise.

The "dhcpcd -k eth0" destroys the cache and releases the "work" IP.
The "dhcpcd -n -H eth0" gets a new IP from the home DHCP server, and
"voila" you're back in business.

Until the Win2K and ANG1105 will cooperate with IP address leases, (not
in Bill's lifetime,) you're probably stuck with executing the two dhcpcd
commands at the end of each migration from home to work and back.

Sorry I couldn't be more help,

Val

-- 
Val W. Harris              vwharris at airmail.net

I'd rather be a failure at something I enjoy
than be a success at something I hate.
- George Burns