Thanks, especially for the bit about the two cards working as expected when connected to two separate switches.
I was trying to test the server before taking it up to our ISP, and I set up both NIC's on one switch, thinking to test them by disconnecting one cable at a time. This returned the strange behaviour I reported: when one cable was disconnected, neither interface answered; when that was re-connected and the other disconnected, both answered! Now trying with each NIC on a different switch gives what I would expect: connection from each net is severed when the cable is disconnected, and re-established when the cable is reconnected. Quite how such strange behaviour can arise when both cards are connected to one switch is well beyond me. A quick check with a Realtek card in place of the EtherExpress PCI revealed the same behaviour, as did a quick re-compile of the kernel with the ethernet card module as a separate driver. Really strange... The strangeness only disappeared when I put the cards on two separate switches. Thanks and best regards, George Karaolides 8, Costakis Pantelides St., tel: +35 79 68 08 86 Strovolos, email: [EMAIL PROTECTED] Nicosia CY 2057, web: www.karaolides.com Republic of Cyprus On Tue, 25 Sep 2001, Theo Zourzouvillys wrote: > Date: Tue, 25 Sep 2001 21:07:14 +0100 > From: Theo Zourzouvillys <[EMAIL PROTECTED]> > To: 'George Karaolides' <[EMAIL PROTECTED]> > Cc: debian-user@lists.debian.org > Subject: RE: Two ethernet cards, one IP?!? > > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > Hi, > > > > Thanks for the reply. > > > > I shall certainly try using ipchains for this, and will let you > > know if it works. > > > > Best regards, > > > > George Karaolides 8, Costakis Pantelides St., > > tel: +35 79 68 08 86 Strovolos, > > email: [EMAIL PROTECTED] Nicosia CY 2057, > > web: www.karaolides.com Republic of Cyprus > > > > > > Another thing worth noting is any virtual interfaces created on eth1 > will not work for some strange reason. > > However, I looked on one of our firewall boxes, which is separating > two networks, routing, and filtering packets. It has one IP address > on either network. This is working fine: > > ~~~~~~~~~~~~~~ > > [EMAIL PROTECTED] apache]# uname -a > Linux w00t 2.4.9 #2 Thu Sep 20 02:36:56 BST 2001 i686 unknown > > [EMAIL PROTECTED] apache]# route -n > Kernel IP routing table > Destination Gateway Genmask Flags Metric Ref > Use Iface > 10.0.0.1 0.0.0.0 255.255.255.255 UH 0 0 > 0 eth1 > 194.93.14x.xxx 0.0.0.0 255.255.255.128 U 0 0 > 0 eth1 > 194.93.12x.xxx 0.0.0.0 255.255.255.0 U 0 0 > 0 eth0 > 192.168.0.0 194.93.14x.x 255.255.255.0 UG 0 0 > 0 eth1 > 0.0.0.0 194.93.12x.x 0.0.0.0 UG 0 0 > 0 eth0 > > [EMAIL PROTECTED] apache]# ifconfig > eth0 Link encap:Ethernet HWaddr 00:02:B3:35:DC:22 > inet addr:194.93.12x.xxx Bcast:194.93.12x.255 > Mask:255.255.255.0 > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:368304 errors:0 dropped:0 overruns:0 frame:0 > TX packets:28724 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:100 > Interrupt:5 > > eth1 Link encap:Ethernet HWaddr 00:02:B3:35:DC:23 > inet addr:194.93.14x.xxx Bcast:194.93.14x.255 > mask:255.255.255.128 > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:67172 errors:0 dropped:0 overruns:0 frame:0 > TX packets:58424 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:100 > Interrupt:5 Base address:0x2000 > > *snip loopback* > > ~~~~~~~~~~~~~~ > > The eepro100 module is compiled into the kernel. > > Thinking back, last year I set up some ISP2150's (virtually the same, > but 2U high) that had one onboard NIC and we added one PCI eepro100 > into them. They worked fine, as we had one on a 213.206.4.xx address > and one on a 10.0.0.x address; on totally different switches. > > > Theo Zourzouvillys > Global Network Consultant > > + Notnet Consultancy [ www.notnet.co.uk ] > - Specialising in Unix security, ISP Start-up and regeneration, > - MySQL solutions, E-commerce, and Load balancing. > + Notnet.co.uk - Quality web hosting at an affordable price > - http://www.notnet.co.uk/ > + Mobile: +44 7747 844 300 > + [EMAIL PROTECTED] > > > -----BEGIN PGP SIGNATURE----- > Version: PGP 7.0.4 > > iQA/AwUBO7Dj8uOPAq8KU5+mEQL4VACg/GztoqPX6uwIIz33fLYml5258I8AnR0/ > AVh4OgOhiI+cI19p9xyNHZh1 > =FQr9 > -----END PGP SIGNATURE----- >
