linux-kernel - Re: [PATCH net-next] pktgen: add ttl option for pktgen

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Date:	Wed, 30 Jul 2014 14:51:19 +0400
From:	Dmitry Popov <ixaphire@...tor.net>
To:	Zhouyi Zhou <zhouzhouyi@...il.com>
Cc:	<rdunlap@...radead.org>, <davem@...emloft.net>,
	<minipli@...glemail.com>, <brouer@...hat.com>,
	<steffen.klassert@...unet.com>, <fan.du@...driver.com>,
	<dborkman@...hat.com>, <fengguang.wu@...el.com>, <tgraf@...g.ch>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<netdev@...r.kernel.org>, Zhouyi Zhou <yizhouzhou@....ac.cn>
Subject: Re: [PATCH net-next] pktgen: add ttl option for pktgen

On Wed, 30 Jul 2014 16:21:26 +0800
Zhouyi Zhou <zhouzhouyi@...il.com> wrote:

> I think it is useful to add ttl option for pktgen, for example
> if a some ISP want to test its network quality, it could set 
> ttl so that the tested links get the packet while end users won't
> get it. 

It seems you're missing 

--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -2799,7 +2799,7 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,

    iph->ihl = 5;
    iph->version = 4;
-   iph->ttl = 32;
+   iph->ttl = pkt_dev->ttl;
    iph->tos = pkt_dev->tos;
    iph->protocol = IPPROTO_UDP;    /* UDP */
    iph->saddr = pkt_dev->cur_saddr;
--
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