On Mon, 3 Aug 1998 Hill.Robertson@stn.siemens.com wrote:
> Date: Mon, 3 Aug 1998 14:43:45 -0400
> From: Hill.Robertson@stn.siemens.com
> Reply-To: isp-tech@isp-tech.com
> To: stnnotes@vectrox.com
> Cc: "'isp-tech@isp-tech.com'" <isp-tech@isp-tech.com>,
> "'linux-net@vger.rutgers.edu'" <linux-net@vger.rutgers.edu>
> Subject: RE: IP Aliasing under Red Hat 5.0 (Weird problem)
>
>
>
>
>
> Jon, I'm not sure which mailing list you saw this on, but ISP-tech has
> been the only one attempting to help me out so far. Let me know and
> I'll include that list in the cc: addresses.
>
> I have decided to grant jon's request and post all the real information
> we are dealing with here. I'll also try and post a summary of what I
> have tried so far.
>
> We have 4 class C addresses assigned to Michiana.net,
> 208.226.220.0-223.0. We have these variably subnetted. The class C we
> are dealing with is 208.226.220.0, here is how it is subnetted out:
>
> 208.226.220.0/30 (Unusable, all 0's and 1's)
> 208.226.220.4/30
> 208.226.220.8/29
> 208.226.220.16/29
> 208.226.220.24/30
> 208.226.220.28/30
> 208.226.220.32/27
> 208.226.220.64/26
> 208.226.220.128/26 (** This is the subnet we are working with in this
> issue **)
> 208.226.220.192/27
> 208.226.220.224/27
> 208.226.220.252/30 (Unusable, all 0's and 1's)
>
> >From anywhere I can ping 208.226.220.135 (255.255.255.192) but I can't
> connect to port 80 from anywhere (including the server it's aliased on).
> One potentially important note here. If I ping one of the other aliased
> IP's from the server itself it answers with the IP:
>
> isp# ping 208.226.220.129
> PING 208.226.220.129 (208.226.220.129): 56 data bytes
> 64 bytes from 208.226.220.129: icmp_seq=0 ttl=255 time=2.4 ms
> 64 bytes from 208.226.220.129: icmp_seq=1 ttl=255 time=2.2 ms
> 64 bytes from 208.226.220.129: icmp_seq=2 ttl=255 time=116.6 ms
>
> --- 208.226.220.129 ping statistics ---
> 3 packets transmitted, 3 packets received, 0% packet loss
> round-trip min/avg/max = 2.2/40.4/116.6 ms
>
> However, if I ping the one that doesn't work for port 80 I get the
> localhost IP number back.
> isp# ping 208.226.220.135
> PING 208.226.220.135 (208.226.220.135): 56 data bytes
> 64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.8 ms
> 64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.5 ms
> 64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.5 ms
>
>
> --- 208.226.220.135 ping statistics ---
> 3 packets transmitted, 3 packets received, 0% packet loss
> round-trip min/avg/max = 0.5/0.6/0.8 ms
>
>
>
> If I ping from any other host it responds with 208.226.220.135 however.
> Go figure.
>
> Things I have tried/checked:
> - routed is not running. I do not run rip.
> - There are no stray routes on the network. (i.e. there are no subnets
> inside of the 208.226.220.128/26 network)
> - I am getting no errors or messages of any kind in the webserver logs.
> - I have rebooted and restarted the webserver (apache) numerous times.
> - ifconfig reports nothing strange.
> - traceroute reports nothing out of the ordinary.
> - the httpd.conf file is correct (i.e. the virtual-server definitions)
> - The only host numbers that exhibit this problem are:
>
> 135:10000111
> 136:10001000
> 143:10001111
> 144:10010000
> 151:10010111
> 152:10011000
> 159:10011111
> 160:10100000
> 167:10100111
> 168:10101000
> 175:10101111
> 176:10110000
> 183:10110111
> 184:10111000
>
> None of these will work.
> - All the rest of the numbers in that network are aliased already and
> work fine. I have also now routed 208.226.222.128/26 to that same host
> and begun aliasing numbers from it for virtual hosting. This is working
> fine (so it isn't simply having too many aliases or anything) except for
> those same numbers in that network.
> - Nothing strange in my syslog.
> - loopback addresses are properly set with the appropriate netmasks.
> - I have also pounded on my desk, banged my head on a wall and paced
> till my co-workers were ready to cement me to my chair, all to no avail.
>
> Does this help? Is there more information that you need? Please let me
> know and I will provide it. (With certain reasonable limitations of
> course. ;-)
>
>
>
>
>
> -----Original Message-----
> From: Jon Lewis [mailto:jlewis@inorganic5.fdt.net]
> Sent: Wednesday, July 29, 1998 9:57 PM
> To: Mark Bainter
> Cc: 'isp-unix@isp-tech.com'; 'isp-tech@isp-tech.com';
> 'linuxisp@friendly.jeffnet.org'
> Subject: Re: IP Aliasing under Red Hat 5.0 (Weird problem)
>
>
> On Tue, 28 Jul 1998, Mark Bainter wrote:
>
> TCP connections to port 80 from anywhere don't work, but you can ping
> them
> from anywhere?...or just from the server?
>
> > The problem follows along all of those ip numbers. Anybody got any
> > answers for me?
>
> Repost the question cleaned up a bit and with the real IP's and people
> can
> look into it. With made up addresses, all they can do is speculate.
>
>
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