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Thread: One of the NICs cannot connect

  1. #1
    Join Date
    Dec 2011
    Beans
    8

    One of the NICs cannot connect

    Hi all,
    I have an Ubuntu machine which is connected to two switches, IDMZ and ODMZ. The firewall is also connected to the ODMZ switch. Firewall address is 192.168.1.1. This Ubuntu box has two network cards.
    The machine can be reached from a 63. address but should be able reachable via a 192. address while inside the firewall. The problem is it can ping yahoo.com just fine but can't ping another machine in the same network or even the default gateway: 192.168.1.1
    Here are some outputs:
    Code:
    ifconfig -a
    eth0      Link encap:Ethernet  HWaddr 90:e6:ba:3c:77:7d
              inet addr:192.168.1.13  Bcast:192.168.1.255  Mask:255.255.255.0
              UP BROADCAST MULTICAST  MTU:1500  Metric:1
              RX packets:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000
              RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
              Interrupt:35 Base address:0xa000
    eth1      Link encap:Ethernet  HWaddr 00:a0:cc:62:34:d5
              inet addr:63.x.x.x  Bcast:63.x.x.x  Mask:255.255.255.128
              inet6 addr: fe80::2a0:ccff:fe62:34d5/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:8024 errors:4 dropped:0 overruns:0 frame:0
              TX packets:436 errors:7 dropped:0 overruns:0 carrier:7
              collisions:0 txqueuelen:1000
              RX bytes:505698 (505.6 KB)  TX bytes:53709 (53.7 KB)
              Interrupt:16 Base address:0xe800
    eth2      Link encap:Ethernet  HWaddr 00:14:d1:1e:9a:31
              BROADCAST MULTICAST  MTU:1500  Metric:1
              RX packets:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000
              RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
              Interrupt:17 Base address:0x2800
    lo        Link encap:Local Loopback
              inet addr:127.0.0.1  Mask:255.0.0.0
              inet6 addr: ::1/128 Scope:Host
              UP LOOPBACK RUNNING  MTU:16436  Metric:1
              RX packets:48 errors:0 dropped:0 overruns:0 frame:0
              TX packets:48 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0
              RX bytes:5032 (5.0 KB)  TX bytes:5032 (5.0 KB)
    Code:
    uname -rvo
    2.6.32-21-server #32-Ubuntu SMP Fri Apr 16 09:17:34 UTC 2010 GNU/Linux
     
    route
    Kernel IP routing table
    Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
    63.x.x.x     *               255.255.255.128 U     0      0        0 eth1
    192.168.1.0     *               255.255.255.0   U     0      0        0 eth0
    default         192.168.1.1     0.0.0.0         UG    100    0        0 eth0
    default         gateway.[half of the domain name here] 0.0.0.0         UG    100    0        0 eth1
    Code:
    arp -n
    Address                  HWtype  HWaddress           Flags Mask            Iface
    192.168.1.5                         (incomplete)                                   eth0
    192.168.1.1                         (incomplete)                                   eth0
    63.x.x.x             ether   00:1e:8c:0d:b5:3a   C                      eth1
    63.x.x.x              ether   00:0d:48:26:43:76   C                       eth1
     
    route -n
    Kernel IP routing table
    Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
    63.x.x.0         0.0.0.0         255.255.255.128 U     0      0        0 eth1
    192.168.1.0    0.0.0.0         255.255.255.0   U     0      0        0 eth0
    0.0.0.0           63.x.x.1        0.0.0.0         UG    100    0        0 eth1
    0.0.0.0         192.168.1.1     0.0.0.0         UG    100    0        0 eth0
    If I try to ping outside of the firewall, it works just fine but if I ping a box which is located inside the firewall, it won't work:
    Code:
    PING 192.168.1.5 (192.168.1.5) 56(84) bytes of data.
    From 192.168.1.13 icmp_seq=1 Destination Host Unreachable
    From 192.168.1.13 icmp_seq=2 Destination Host Unreachable
    From 192.168.1.13 icmp_seq=3 Destination Host Unreachable
    Can someone please help me figure this out? I would really appreciate it.

    Thanks,
    Tezarin

  2. #2
    Join Date
    Mar 2008
    Location
    Queensland Australia
    Beans
    664
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: One of the NICs cannot connect


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