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Thread: loopback stops working after some uptime

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  1. #1
    Join Date
    Aug 2012
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    loopback stops working after some uptime

    This just started like 4 or 5 days ago. I'm running Ubuntu 12.04 desktop, and after about 12 hours of uptime it seems the loopback device just stops working. If I do an ifconfig, it looks like it's still there, but if I ping localhost or 127.0.0.1, both fail. Also, pinging known DNS addresses (www.google.com) fail. But pinging by IP works fine.

    The rest of the networking features seem unphased. I can still reach the Samba share from my Windows machine. Also, I run an Apache server that is still reachable from the outside world. Looking at the resources monitor, the CPU and memory usage appear normal when this happens.

    If I restart the machine, everything is fine again. For about 12 hours, until it happens again. Any ideas on what could be causing this or how to diagnose it? Thanks.

    Disclaimer: Please excuse my n00b-ishness. I'm a long-time Windows guy that just started using Ubuntu 6 months ago.

  2. #2
    Join Date
    Aug 2012
    Beans
    2

    Re: loopback stops working after some uptime

    Bump.

    Additionally, this is happening on an nforce ethernet port built into my motherboard. Below is some diagnostic info I collected. Does any of it look out of the ordinary?

    HTML Code:
    ~$ ip addr
    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
        link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
        inet 127.0.0.1/8 scope host lo
        inet6 ::1/128 scope host 
           valid_lft forever preferred_lft forever
    2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
        link/ether 00:1b:fc:64:dc:82 brd ff:ff:ff:ff:ff:ff
        inet 192.168.1.132/24 brd 192.168.1.255 scope global eth0
        inet6 fe80::21b:fcff:fe64:dc82/64 scope link 
           valid_lft forever preferred_lft forever
    
    ~$ netstat -rn
    Kernel IP routing table
    Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
    0.0.0.0         192.168.1.1     0.0.0.0         UG        0 0          0 eth0
    169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
    192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0 eth0
    
    ~$ getent hosts localhost
    127.0.0.1       localhost
    
    ~$ ping 127.0.0.1
    PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
    ^C
    --- 127.0.0.1 ping statistics ---
    572 packets transmitted, 0 received, 100% packet loss, time 575551ms
    
    
    ~$ ping6 ::1
    PING ::1(::1) 56 data bytes
    64 bytes from ::1: icmp_seq=1 ttl=64 time=0.020 ms
    64 bytes from ::1: icmp_seq=2 ttl=64 time=0.023 ms
    64 bytes from ::1: icmp_seq=3 ttl=64 time=0.025 ms
    64 bytes from ::1: icmp_seq=4 ttl=64 time=0.021 ms
    64 bytes from ::1: icmp_seq=5 ttl=64 time=0.028 ms
    64 bytes from ::1: icmp_seq=6 ttl=64 time=0.025 ms
    64 bytes from ::1: icmp_seq=7 ttl=64 time=0.023 ms
    64 bytes from ::1: icmp_seq=8 ttl=64 time=0.026 ms
    64 bytes from ::1: icmp_seq=9 ttl=64 time=0.021 ms
    64 bytes from ::1: icmp_seq=10 ttl=64 time=0.028 ms
    ^C
    --- ::1 ping statistics ---
    10 packets transmitted, 10 received, 0% packet loss, time 8998ms
    rtt min/avg/max/mdev = 0.020/0.024/0.028/0.002 ms
    
    ~$ ifconfig
    eth0      Link encap:Ethernet  HWaddr 00:1b:fc:64:dc:82  
              inet addr:192.168.1.132  Bcast:192.168.1.255  Mask:255.255.255.0
              inet6 addr: fe80::21b:fcff:fe64:dc82/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:5537467 errors:0 dropped:0 overruns:0 frame:0
              TX packets:7700200 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:2390500721 (2.3 GB)  TX bytes:8274946292 (8.2 GB)
              Interrupt:23 Base address:0x4000 
    
    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:1441430 errors:0 dropped:0 overruns:0 frame:0
              TX packets:1441430 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:2084259522 (2.0 GB)  TX bytes:2084259522 (2.0 GB)

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