help needed
shatam bhattacharya
mailshatam at yahoo.co.in
Fri Mar 26 14:01:16 UTC 2004
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
00:00.0 Host bridge: Intel Corp. 82845G/GL [Brookdale-G] Chipset Host Bridge (rev 01)
00:02.0 VGA compatible controller: Intel Corp. 82845G/GL [Brookdale-G] Chipset Integrated Graphics Device (rev 01)
00:1d.0 USB Controller: Intel Corp. 82801DB USB (Hub #1) (rev 01)
00:1d.1 USB Controller: Intel Corp. 82801DB USB (Hub #2) (rev 01)
00:1d.2 USB Controller: Intel Corp. 82801DB USB (Hub #3) (rev 01)
00:1d.7 USB Controller: Intel Corp. 82801DB USB EHCI Controller (rev 01)
00:1e.0 PCI bridge: Intel Corp. 82801BA/CA/DB PCI Bridge (rev 81)
00:1f.0 ISA bridge: Intel Corp. 82801DB ISA Bridge (LPC) (rev 01)
00:1f.1 IDE interface: Intel Corp. 82801DB ICH4 IDE (rev 01)
00:1f.3 SMBus: Intel Corp. 82801DB SMBus (rev 01)
00:1f.5 Multimedia audio controller: Intel Corp. 82801DB AC'97 Audio (rev 01)
01:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
ifconfig output
eth0
Link encap:Ethernet HWaddr 00:08:A1:32:E1:7E
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
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
RX bytes:26209 (25.5 Kb) TX bytes:26209 (25.5 Kb)
Netstat -rn
Kernel IP routing table
Destination Gway Genmask Flags MSS Window irtt Iface
172.31.64.0 0.0.0.0 255.255.252.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 172.31.65.21 0.0.0.0 UG0 0 0 eth0
>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
contents of /etc/syconfig/network
NETWORKING=yes
HOSTNAME=ginie
GATEWAY=172.31.65.21
>This is starting to sound like a firewall issue, >innit?
>What's the output of 'iptables -L'?
>If you get an error because iptables isn't running, >make sure that
>that ugly chains crud isn't in the way by running >'lokkit' and taking
>appropriate steps.
>Andy
iptables -L
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 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:http 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 -- anywhere 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
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