[syslinux] syslinux.efi pxeboot across multiple subnets

[Gene Cumm]

On Sat, Nov 9, 2013 at 3:07 PM, Geert Stappers <stappers at stappers.nl> wrote:
>
> Answer:
>     Because it messes up the order in which people normally read text,
>     especially the archives of mailing lists.
>
> Question:
>     Why is Top-posting such a bad thing?
>
>
> Op 2013-11-09 om 09:22 schreef Jason Matthews:
>> On Sat, Nov 9, 2013 at 4:33 AM, Geert Stappers wrote:
>> > Op 2013-11-08 om 15:44 schreef H. Peter Anvin:
>> > >
>> > > syslinux.efi either crashed or just can't get packets out.  Either of
>> > > which is bad, obviously.
>> >
>> > And a thrid option, still bad: Send out packets didn't get across gateway.
>> >
>> > That is possible when the mirror port is at the same side of a gateway
>> > as the TFTP server is. Euh, I mean visible where I said possible.
>> >
>> > Please confirm where in the network the tcpdump is made,
>> > or even better: capture the packets near the booting machine.
>> >
>> > Something else: How many gateway / routers are involved?
>> >
>>
>> The setup I was using was in a chassis. Slot 8 of the chassis is the client
>> machine. It goes through Switch 1 (a Brocade switch) to the top of rack
>> (BNT). The mirror is in the chassis switch. Slot 3 of the same chassis is
>> connected to the mirror port in Switch 1.
>>
>> client = 1/0/8
>> tcpdump = 1/0/3
>> to TOR = 1/0/43
>> 1/0/8 mirrored both directions to 1/0/3
>>
>> Unfortunately, I don't have access to the switch configs of the TOR
>> switches so I can't say how many gateways it's going through. 10.16.233.20
>> goes through 10.16.233.1 and 10.16.195.178 goes through 10.16.194.1. All
>> the switch magic after that is hidden from me.
>
> Okay, thanks for elaborationg. Summary so far:
>
> * network capture is done elsewhere as client is.
> * syslinux.efi gets through
> * When syslinux.efi should run, there is no sign of it in the network capture.
>
>
> Regards
> Geert Stappers
> --
> Yes, it is good to respect the discussion order

Traceroute from the TFTP system to the client can answer the count of
"route" hops as can IP TTL.

-- 
-Gene