[LTP] [PATCH] ipneigh01.sh: Fix an issue where ipneigh01_arp test case fail due to ARP timeout

[Petr Vorel]

Hi Xu,

> When the ARP status of the rhost is stale,
> lhost ping rhost and the lhost deletes the ARP record,
> the record in the rhost changes from stale to delay.
> Then, the probe request is sent to the lhost, and the lhost ARP information is updated.

>    rhost(10.0.0.1)      lhost(10.0.0.2)
> t1 10.0.0.2 STALE       ping 10.0.0.1
>                         10.0.0.1 REACHABLE
>                         arp -d 10.0.0.1
> t2 10.0.0.2 DELAY
> t3 probe 10.0.0.2
> t4                      10.0.0.1 REACHABLE

> Clear the ARP entries of rhost before each round of test.

Do you have idea why ARP status of the rhost is stale?
I've never encountered problem like this.

> Signed-off-by: Xu Senmiao <xusenmiao@huawei.com>
> ---
>  testcases/network/tcp_cmds/ipneigh/ipneigh01.sh | 1 +
>  1 file changed, 1 insertion(+)

> diff --git a/testcases/network/tcp_cmds/ipneigh/ipneigh01.sh b/testcases/network/tcp_cmds/ipneigh/ipneigh01.sh
> index e67ff5cc8..4db675f8f 100755
> --- a/testcases/network/tcp_cmds/ipneigh/ipneigh01.sh
> +++ b/testcases/network/tcp_cmds/ipneigh/ipneigh01.sh
> @@ -56,6 +56,7 @@ do_test()
>  	tst_res TINFO "stress auto-creation $entry_name cache entry deleted with '$CMD' $NUMLOOPS times"

>  	for i in $(seq 1 $NUMLOOPS); do
> +		tst_rhost_run -c "arp -d $(tst_ipaddr lhost)"
IMHO we use $DEL_CMD as we use later in the test function, because some systems
does not have arp installed.  i.e. use the tool which is used for testing.
Otherwise we endup with: sh: arp: command not found

Kind regards,
Petr