Red Hat Bugzilla – Bug 145180
-arp flag to ifconfig doesn't work
Last modified: 2007-11-30 17:07:06 EST
From Bugzilla Helper: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0 Description of problem: Bringing and interface up using "ifconfig X.X.X.X netmask A.A.A.A -arp" does not set the NOARP parameter on the interface and the ip address responds to arpings from other machines on the network. Additionally setting the ARP=no parameter in the ifcfg-ethX file demonstrates the same behaviour. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. ifconfig ethX X.X.X.X netmask A.A.A.A -arp OR ifcfg-ethX setup as DEVICE=eth0 ONBOOT=yes BOOTPROTO=static IPADDR=XX.XX.XX.XX NETMASK=XX.XX.XX.XX ARP=no Actual Results: eth0 Link encap:Ethernet HWaddr :0:6B:84:C9:00 inet addr:XX.XX.XX.XX Bcast:XX.XX.XX.XX Mask:XX.XX.XX.XX UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3807534 errors:0 dropped:0 overruns:0 frame:0 TX packets:2214409 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:477367079 (455.2 Mb) TX bytes:873930766 (833.4 Mb) Interrupt:11 Base address:0x2000 Memory:c0100000-c0100038 Expected Results: eth0 Link encap:Ethernet HWaddr :0:6B:84:C9:00 inet addr:XX.XX.XX.XX Bcast:XX.XX.XX.XX Mask:XX.XX.XX.XX UP BROADCAST NOARP RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3807534 errors:0 dropped:0 overruns:0 frame:0 TX packets:2214409 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:477367079 (455.2 Mb) TX bytes:873930766 (833.4 Mb) Interrupt:11 Base address:0x2000 Memory:c0100000-c0100038 Additional info: Interfaces with ARP flag set to no or -arp option set should not respond to arpings but they do.
Hmm, this works for me as it's supposed to work. Would be great to have your net-tools version here and also the kernel you're currently using. Here's my test case root@garfield ~# ifconfig 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:10050 errors:0 dropped:0 overruns:0 frame:0 TX packets:10050 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:6285371 (5.9 MiB) TX bytes:6285371 (5.9 MiB) root@garfield ~# ifconfig eth0 192.168.1.13 netmask 255.255.255.0 -arp root@garfield ~# ifconfig eth0 eth0 Link encap:Ethernet HWaddr 00:0F:1F:78:0D:18 inet addr:192.168.1.13 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::20f:1fff:fe78:d18/64 Scope:Link UP BROADCAST RUNNING NOARP MULTICAST MTU:1500 Metric:1 ^^^^^ RX packets:49866 errors:0 dropped:0 overruns:0 frame:0 TX packets:48339 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:57890262 (55.2 MiB) TX bytes:4388231 (4.1 MiB) Base address:0xdf40 Memory:fcfe0000-fd000000 root@garfield ~# ifconfig eth0 arp root@garfield ~# ifconfig eth0 eth0 Link encap:Ethernet HWaddr 00:0F:1F:78:0D:18 inet addr:192.168.1.13 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::20f:1fff:fe78:d18/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:49871 errors:0 dropped:0 overruns:0 frame:0 TX packets:48342 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:57890721 (55.2 MiB) TX bytes:4388443 (4.1 MiB) Base address:0xdf40 Memory:fcfe0000-fd000000