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Posted to users@httpd.apache.org by Leon Oosterwijk <le...@daveramsey.com> on 2003/06/13 21:14:07 UTC
RE: [users@httpd] LAN team says I have 2 IP's w/1 MAC address, but I have 2 cables with 2 separate IP's. What gives?
Hey
It is possible that both eth0 and eth1 is an alias for the same nic? you
said they're 2 different cards but you use the same module for both of them.
did you set up different irq's etc for loading module 2?
Sincerely,
Leon Oosterwijk
> -----Original Message-----
> From: Hulslander, Ryan [mailto:Ryan.Hulslander@ps.net]
> Sent: Friday, June 13, 2003 1:45 PM
> To: users@httpd.apache.org
> Subject: [users@httpd] LAN team says I have 2 IP's w/1 MAC address, but
> I have 2 cables with 2 separate IP's. What gives?
>
>
> I'm really, REALLY hoping someone can shed some light on this.
>
> The hardware is a Soyo K-333 Dragon MB running SuSE 8.0 w/Apache2
> as well as
> Samba. I have 2 NIC's, the onboard NIC and a D-Link 530TX+ card.
> I have two
> IP addresses, 155.16.78.54 & .55 on eth0 I get lots of
> collisions, errors,
> etc., and barely any traffic on eth1. I have one "site.net"
> address and one
> site.com" address, both configured as virtual hosts in Apache.
>
> The problem I have is that both NIC's seem to be set at 10MB half-duplex,
> and mii-tool won't get them to negotiate to 100 full-duplex, nor will it
> force it. The LAN team says it sees both cables coming in to the
> switch, and
> that both IP's are being seen as the same MAC address?! (I pasted their
> exact comments to me below)
>
> The performance isn't really noticeable for Apache until I tried
> to turn on
> Samba, and then it just about craters it.
>
> Here's the dump of the ifconfig:
>
> eth0 Link encap:Ethernet HWaddr 00:05:5D:D0:29:80
> inet addr:155.16.78.54 Bcast:155.16.78.255 Mask:255.255.255.0
> inet6 addr: fe80::205:5dff:fed0:2980/10 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:23619268 errors:1053 dropped:0 overruns:0 frame:0
> TX packets:3752750 errors:380508 dropped:0 overruns:0
> carrier:761016
> collisions:105122 txqueuelen:100
> RX bytes:1116970680 (1065.2 Mb) TX bytes:2828485063 (2697.4 Mb)
> Interrupt:10 Base address:0x2000
>
> eth1 Link encap:Ethernet HWaddr 00:50:2C:04:DA:D5
> inet addr:155.16.78.53 Bcast:155.16.78.255 Mask:255.255.255.0
> inet6 addr: fe80::250:2cff:fe04:dad5/10 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:20789796 errors:0 dropped:0 overruns:0 frame:0
> TX packets:504 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:100
> RX bytes:411341177 (392.2 Mb) TX bytes:30288 (29.5 Kb)
> Interrupt:11 Base address:0x4000
>
> The modules.conf file load "8139too" driver for both interfaces, and the
> mii-tool reports on both:
>
> forum:/etc # mii-tool eth0
> eth0: 10 Mbit, half duplex, no link
> forum:/etc # mii-tool eth1
> eth1: 10 Mbit, half duplex, no link
>
> No amount of trying to force the eth0 or eth1 interfaces to 100MB work.
>
> The comments I got from the LAN guy was:
>
> -------------
>
> After clearing the IP ARP tables on both routers there is something really
> strange going on, see information below. The r4-pscptc4 router is the
> gateway router 155.16.78.1.
>
> r3-pscptc3#sh ip arp 155.16.78.54
> Protocol Address Age (min) Hardware Addr Type Interface
> Internet 155.16.78.54 0 0005.5dd0.2980 ARPA Vlan78
> r3-pscptc3#sh ip arp 155.16.78.53
> Protocol Address Age (min) Hardware Addr Type Interface
> Internet 155.16.78.53 0 0005.5dd0.2980 ARPA Vlan78
>
> r4-pscptc4#sh ip arp 155.16.78.53
> Protocol Address Age (min) Hardware Addr Type Interface
> Internet 155.16.78.53 1 0050.2c04.dad5 ARPA Vlan78
> r4-pscptc4#sh ip arp 155.16.78.54
> Protocol Address Age (min) Hardware Addr Type Interface
> Internet 155.16.78.54 1 0005.5dd0.2980 ARPA Vlan78
>
> The bottom line of the above information is even after clearing
> both routers
> ARP tables (twice) the r3-pscptc3 router is still seeing both IP addresses
> as the same MAC address. Routers don't just show this type of
> behavior for
> any reason. The MAC address 00-50-2c-04-da-d5 for 155.16.78.53
> is not even
> known to the CAM table on either switch (s3 or s4). As a
> suggestion I would
> check with the OS vendor to see if there are any known issues.
>
> ------------
>
> I'm clueless. I've pulled up some docs regarding similar situations and it
> talks about "iptables" or some such. Is there some kind of
> mapping someplace
> to make sure the right NIC responds to the right IP's, etc., so my website
> and Samba can start working right?
>
> Thank You, Thank You, Thank You!
>
> Ryan Hulslander
> "Completely Baffled by this in Dallas"
>
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