DHCP Client error- rfc3442-classless-routes returned non-zero exit status 2

Shr0912 · 01-16-2018, 05:25 AM

Using Debian 4.9.0-3-amd64 virtual machine with following network configuaration.
ifconfig -a

Code:

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1460
        inet 10.142.0.2  netmask 255.255.255.255  broadcast 10.142.0.2
        ether 42:01:0a:8e:00:02  txqueuelen 1000  (Ethernet)
        RX packets 36655970  bytes 16550631459 (15.4 GiB)
        RX errors 0  dropped 0  overruns 0  frame 441
        TX packets 50174357  bytes 20433681778 (19.0 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1  (Local Loopback)
        RX packets 142874  bytes 12105334 (11.5 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 142874  bytes 12105334 (11.5 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

cat /etc/network/interfaces

Code:

## interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d
auto eth0
iface eth0 inet dhcp#

Issue is /var/log/syslog is flooded with messages as below

Code:

Jan 16 10:10:58 pdp-dev1 root: /etc/dhcp/dhclient-exit-hooks.d/rfc3442-classless-routes returned non-zero exit status 2
Jan 16 10:10:58 pdp-dev1 dhclient[566]: DHCPDECLINE on eth0 to 255.255.255.255 port 67
Jan 16 10:10:58 pdp-dev1 dhclient[566]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7
Jan 16 10:10:58 pdp-dev1 dhclient[566]: DHCPREQUEST of 10.142.0.2 on eth0 to 255.255.255.255 port 67
Jan 16 10:10:58 pdp-dev1 dhclient[566]: DHCPOFFER of 10.142.0.2 from 169.254.169.254
Jan 16 10:10:58 pdp-dev1 dhclient[566]: DHCPACK of 10.142.0.2 from 169.254.169.254
Jan 16 10:10:58 pdp-dev1 root: /etc/dhcp/dhclient-exit-hooks.d/rfc3442-classless-routes returned non-zero exit status 2

AwesomeMachine · 01-19-2018, 10:24 PM

Is syslog ridiculously flooded, like 10,000 messages. If so, you can probably tweak tyhe dhclient script to suppress logging one level higher. Otherwise, if that's the only problem, and everything works correctly, you can ignore it.

Shr0912 · 01-22-2018, 01:10 AM

Logs suppressing didn't worked out for me since the frequency of logs was too high.

Eventually, root disk space got 100% full and my system got crashed. After, i logged in to console to fix up and when the system was booting , i got this message related to dhcp
===
05:32:08 ifup[481]: /sbin/dhclient-script: 28: .: Can't open /usr/share/sendmail/dynamic
==

Created this /usr/share/sendmail/dynamic and issue got resolved.

But i still have this question- I could not see this error anywhere before in the logs. Why is it that so. If i would have got this error before, i could have fixed it up before crash.