<DIV> Hi, The original problem was that I am not able to connect my rhl 9 box to my college LAN. I am including the following trouble shooting info and the clarification for the subnet mask (after consulting the NA) is that it is actually 255.255.0.0 for our hostel. I regret the mistake of giving the wrong data. The college server is based on rhl 9. I can ping only my system with ip 172.31.65.21 (local) and not even the systems connected through my switch ( on the same floor) . Please take a look at the following. And by the way ping is not disabled as it working on other systems. One important question is that if I make up my mind of reinstalling rhl 9 what factors should I keep in mind to avoid such problems in future ?Please suggest ! the needfull. with thanks and regards shatam uname -a Linux gomti 2.4.20-8smp #1 SMP Thu Mar 13 17:45:54 EST 2003 i686 i686 i386 GNU/Linux lspci output<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p> 00:00.0 Host bridge: Intel Corp. 82845G/GL [Brookdale-G] <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place><st1:PlaceName>Chipset</st1:PlaceName> <st1:PlaceName>Host</st1:PlaceName> <st1:PlaceType>Bridge</st1:PlaceType></st1:place> (rev 01)<o:p></o:p> 00:02.0 VGA compatible controller: Intel Corp. 82845G/GL [Brookdale-G] Chipset Integrated Graphics Device (rev 01)<o:p></o:p> 00:1d.0 USB Controller: Intel Corp. 82801DB USB (Hub #1) (rev 01)<o:p></o:p> 00:1d.1 USB Controller: Intel Corp. 82801DB USB (Hub #2) (rev 01)<o:p></o:p> 00:1d.2 USB Controller: Intel Corp. 82801DB USB (Hub #3) (rev 01)<o:p></o:p> 00:1d.7 USB Controller: Intel Corp. 82801DB USB EHCI Controller (rev 01)<o:p></o:p> 00:1e.0 PCI bridge: Intel Corp. 82801BA/CA/DB PCI Bridge (rev 81)<o:p></o:p> 00:1f.0 ISA bridge: Intel Corp. 82801DB ISA Bridge (LPC) (rev 01)<o:p></o:p> 00:1f.1 IDE interface: Intel Corp. 82801DB ICH4 IDE (rev 01)<o:p></o:p> 00:1f.3 SMBus: Intel Corp. 82801DB SMBus (rev 01)<o:p></o:p> 00:1f.5 Multimedia audio controller: Intel Corp. 82801DB AC'97 Audio (rev 01)<o:p></o:p> 01:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)<o:p></o:p> <o:p> </o:p> ifconfig output<o:p></o:p> eth0 Link encap:Ethernet HWaddr 00:08:A1:32:E1:7E <o:p></o:p> inet addr:172.31.65.21 Bcast:172.31.67.255 Mask:255.255.252.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1 errors:1286 dropped:0 overruns:0 frame:0 TX packets:52 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:60 (60.0 b) TX bytes:3120 (3.0 Kb)Interrupt:9 Base address:0xcc00 <o:p></o:p> lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:375 errors:0 dropped:0 overruns:0 frame:0 TX packets:375 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 <o:p></o:p> RX bytes:26209 (25.5 Kb) TX bytes:26209 (25.5 Kb)<o:p></o:p> <o:p> </o:p> Netstat -rn<o:p></o:p> Kernel IP routing table<o:p></o:p> Destination Gway Genmask Flags MSS Window irtt Iface<o:p></o:p> 172.31.64.0 0.0.0.0 255.255.252.0 U 0 0 0 eth0<o:p></o:p> 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0<o:p></o:p> 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo<o:p></o:p> 0.0.0.0 172.31.65.21 0.0.0.0 UG0 0 0 eth0<o:p></o:p> <o:p> </o:p> <o:p>>The default route is normally contained in >the /etc/sysconfig/network >file as the "GATEWAY=" equate. Here's an example: >NETWORKING=yes >HOSTNAME=prophead.corp.publichost.com >GATEWAY=192.168.0.1 >If you don't have a default route, you can add one using this command: >route add -default gw ip-addr-of-your-gateway >For example, to set up the default route as if it were in the network >file: >route add -default gw 192.168.0.1 </o:p> <o:p></o:p>contents of /etc/syconfig/network<o:p></o:p> NETWORKING=yes<o:p></o:p> HOSTNAME=ginie<o:p></o:p> GATEWAY=172.31.65.21<o:p></o:p> <o:p> </o:p> >This is starting to sound like a firewall issue, >innit?<o:p></o:p> <o:p> </o:p> >What's the output of 'iptables -L'?<o:p></o:p> >If you get an error because iptables isn't running, >make sure that<o:p></o:p> >that ugly chains crud isn't in the way by running >'lokkit' and taking<o:p></o:p> >appropriate steps.<o:p></o:p> <o:p> </o:p> >Andy<o:p></o:p> <o:p> </o:p> <o:p>iptables -L</o:p> Chain INPUT (policy ACCEPT) target prot opt source destination RH-Lokkit-0-50-INPUT all -- anywhere anywhere Chain FORWARD (policy ACCEPT) target prot opt source destination RH-Lokkit-0-50-INPUT all -- anywhere anywhere Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain RH-Lokkit-0-50-INPUT (2 references) target prot opt source destination ACCEPT udp -- 172.31.100.8 anywhere udp spt:domain dpts:1025:65535 ACCEPT udp -- 172.31.100.6 &nbs! p; anywhere udp spt:domain dpts:1025:65535 ACCEPT tcp -- anywhere anywhere tcp dpt:smtp flags:SYN,RST,ACK/SYN ACCEPT tcp -- anywhere anywhere tcp dpt:h! ttp flags:SYN,RST,ACK/SYN ACCEPT tcp -- anywhere anywhere tcp dpt:ftp flags:SYN,RST,ACK/SYN ACCEPT tcp -- anywhere anywhere tcp dpt:ssh flags:SYN,RST,ACK/SYN ACCEPT tcp -- anywhere anywhere tcp dpt:telnet flags:SYN,RST,ACK/SYN ACCEPT udp -- anywhere anywhere udp spts:bootps:bootpc dpts:bootps:bootpc ACCEPT udp -- anywh! ere anywhere udp spts:bootps:bootpc dpts:bootps:bootpc ACCEPT all -- anywhere anywhere ACCEPT all -- anywhere anywhere REJECT tcp -- anywhere anywhere tcp dpts:0:1023 flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable REJECT tcp -- anywhere anywhere tcp dpt:nfs flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable REJECT udp -- anywhere anywhere udp dpts:0:1023 reject-with icmp-port-unreachable REJECT udp -- anywhere anywhere udp dpt:nfs reject-with icmp-port-unreachable REJECT tcp -- anywhere anywhere tcp dpts:x11:6009 flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable REJECT tcp -- anywhere anywhere tcp dpt:xfs flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable <o:p> </o:p> </DIV> <a href="http://in.rd.yahoo.com/specials/mailtg/*http://pepsizone.yahoo.co.in/pepsi3/cktkipyaas/" target="_blank"> Win an evening</a> with the Indian cricket captain: <a href="http://in.rd.yahoo.com/specials/mailtg2/*http://pepsizone.yahoo.co.in/pepsi3/cktkipyaas/" target="_blank"> Yahoo! India Promos</a>.