Strange bootpd behavior (server side)

Strange bootpd behavior (server side)

[Kevin Fry]

I'm having a small problem with our redhat 6.2 bootp server and maybe
yous guys can shed some light on it for me.   The problem is that
whenever our DSL internet connection is down(which is too much.. I wish
cable was available!), the bootpd stops responding to requests.. I can
see the requests with tcpdump, but no replys. and when the internet is
up sometimes is takes a little bit for the bootpd to respond to
requests.
    I think it's doing DNS resolution and if it can't find a DNS server
when the net's down, it just stops working. Does linux automatically do
name resolution on every address it gets? If so can i turn this off?
    Our network is behind a DSL modem/router (Flowpoint 2200) acting as
gateway(192.168.254.254), and we have 3 switches after that.
    A lot of the time the router is finicky with linux even when
everything is working.. I know this is a bit off topic, but ANY
suggestions are very welcome.

Here's my routing table..

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
192.168.254.13 *                   255.255.255.255 UH    0      0
0 eth0
192.168.254.0   *                   255.255.255.0   U     0
0        0 eth0
127.0.0.0       *                       255.0.0.0       U     0
0        0 lo
default    192.168.254.254    0.0.0.0         UG    0      0        0
eth0

Thanks!
Kevin Fry


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Re: Strange bootpd behavior (server side)

[Ron Flory]

Kevin Fry wrote:
>
> I'm having a small problem with our redhat 6.2 bootp server and maybe
> yous guys can shed some light on it for me.   The problem is that
> whenever our DSL internet connection is down(which is too much.. I wish
> cable was available!), the bootpd stops responding to requests.. I can
> see the requests with tcpdump, but no replys. and when the internet is
> up sometimes is takes a little bit for the bootpd to respond to
> requests.
>     I think it's doing DNS resolution and if it can't find a DNS server
> when the net's down, it just stops working. Does linux automatically do
> name resolution on every address it gets? If so can i turn this off?
>     Our network is behind a DSL modem/router (Flowpoint 2200) acting as
> gateway(192.168.254.254), and we have 3 switches after that.
>     A lot of the time the router is finicky with linux even when
> everything is working.. I know this is a bit off topic, but ANY
> suggestions are very welcome.

 it sounds like 'fun with PAM' that causes similar problems with my
TFTP server.  I need to write a simple inetd replacement (sans PAM)
just for TFTP, so we don't get killed by the delays caused by PAM
authorization checks.

ron

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Re: Strange bootpd behavior (server side)

[Mark Powell]

On 07-Aug-2001 Ron Flory wrote:
>
>   it sounds like 'fun with PAM' that causes similar problems with my
>  TFTP server.  I need to write a simple inetd replacement (sans PAM)
>  just for TFTP, so we don't get killed by the delays caused by PAM
>  authorization checks.

You might like to look at the tcpserver program, part of the ucspi-tcp
package http://pobox.com/~djb/ucspi-tcp.html

It monitors a given port, like inetd and runs a given program handle
connections.


--
Mark Powell, Senior Software Engineer, Primagraphics Limited
New Cambridge House, Litlington, nr.Royston, Herts, SG8 0SS, UK
Tel. +44 1763 852222, Fax. 853324, medp@primag.co.uk, http://www.primag.co.uk


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Re: Strange bootpd behavior (server side)

[Andrew Dixon]

Check out the NAG:
	http://www.linuxdoc.org/LDP/nag2/index.html
and there are probably a bunch of mail lists for Red Hat Network
Administration.  I can't recommend one because I use Debian.  (If you
want to upgrade your server from Dead Rat to Debian though
debian-user@lists.debian.org is a great list ;)

later,
Andy


Kevin Fry wrote:
>
> I'm having a small problem with our redhat 6.2 bootp server and maybe
> yous guys can shed some light on it for me.   The problem is that
> whenever our DSL internet connection is down(which is too much.. I wish
> cable was available!), the bootpd stops responding to requests.. I can
> see the requests with tcpdump, but no replys. and when the internet is
> up sometimes is takes a little bit for the bootpd to respond to
> requests.
>     I think it's doing DNS resolution and if it can't find a DNS server
> when the net's down, it just stops working. Does linux automatically do
> name resolution on every address it gets? If so can i turn this off?
>     Our network is behind a DSL modem/router (Flowpoint 2200) acting as
> gateway(192.168.254.254), and we have 3 switches after that.
>     A lot of the time the router is finicky with linux even when
> everything is working.. I know this is a bit off topic, but ANY
> suggestions are very welcome.
>
> Here's my routing table..
>
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> 192.168.254.13 *                   255.255.255.255 UH    0      0
> 0 eth0
> 192.168.254.0   *                   255.255.255.0   U     0
> 0        0 eth0
> 127.0.0.0       *                       255.0.0.0       U     0
> 0        0 lo
> default    192.168.254.254    0.0.0.0         UG    0      0        0
> eth0
>
> Thanks!
> Kevin Fry
>

--
Andrew Dixon
Software Engineer
Seranoa Networks
978.897.3434 x231

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