Re: Bootp Timeout Problem

[Joel Jaeggli]

On Mon, 15 Oct 2001 [e-mail] wrote:

> Lars - I came across the message below while searching to a solution for a
> DHCP timeout issue. I'm fairly certain that this fix is relevant to the
> problem I'm investigating. We're working with a floppy linux distro that
> Novell created for imaging Novell workstations and I hope to apply this
> patch to the floppy distro to see if it is the fix we're looking for (we
> suspect Spantree Portfast on Cisco Catalyst3524XLs is tripping up DHCP
> acquisition)..
>
> I'm a bit of a linux newbie - does this involve editing the ifconfig.c file

yeah it will require a kernel rebuild...

assuming you have a kernel tree someplace for this mini distro (for
example in /usr/src/linux) you'd need to apply the patch to the file
/usr/src/linux/net/ipv4/ipconfig.c then rebuild the kernel...

regards
joelja

> only, or is a recompile or any components (or even the kernel?)  required
> to cause the change to take effect? If so, I expect the various FAQs can
> walk me through the actual procedure.
>
> LKML - apologies if this is off-topic, please reply off-list or CC me.
>
> thanks much,
> -carl hirsch
> network analyst
>
> From: Lars Magne Ingebrigtsen ([e-mail])
> Date: Sat Jul 29 2000 - 06:16:33 EST
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>
>
> The Cisco Catalyst 3500 switch has what seems like a training period
> of about ten seconds. Therefore, the default 3*2 second waiting
> period between card resets is too small to allow a Linux bootp client
> to boot through one of these switches.
>
>
> The following micro-patch just increases the CONF_SEND_RETRIES (which
> says how many bootp packets to send out between reopening the device(s))
> from 3 to 10, which fixes the problem.
>
>
> --- ipconfig.c~ Wed Jun 7 23:26:44 2000
> +++ ipconfig.c Sat Jul 29 12:53:18 2000
> @@ -75,7 +75,7 @@
>
>
>  /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
>  #define CONF_OPEN_RETRIES 3 /* (Re)open devices three times */
> -#define CONF_SEND_RETRIES 3 /* Send requests three times */
> +#define CONF_SEND_RETRIES 10 /* Send requests ten times */
>  #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
>  #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
>  #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
>
>
> --
> (domestic pets only, the antidote for overdose, milk.)
>    [e-mail] * Lars Magne Ingebrigtsen
>
>
>
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Joel Jaeggli				       [e-mail]
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