Date: Fri, 9 Dec 2005 11:41:21 +0000 From: Alvaro Saurin <saurin@dcs.gla.ac.uk> To: atanas atanas <atanas.yankov@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: Dummynet and fragments Message-ID: <986A5F8C-52A2-43A5-99F2-5ADDD11AD16A@dcs.gla.ac.uk> In-Reply-To: <314d88f90512090148m143b0f83u8dbc0c28e3ab9b4c@mail.gmail.com> References: <314d88f90512090148m143b0f83u8dbc0c28e3ab9b4c@mail.gmail.com>
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Hi,
I have tested your patch and it works fine for me. Thanks.
Alvaro
On 9 Dec 2005, at 09:48, atanas atanas wrote:
> As i see nobody here answer to me and to other guys i make my own
> ivestigation of the problem with dummynet and why it's produce broken
> fragments in 5.x 6.x RELEASES
> in my debug's i found what couse the problem ;))) , here is my
> debugs all
> made on outgoing interaface after they live pipe's
>
> My Desktop PC ---- >>>
>
> 192.168.135.213 > 195.69.108.254: icmp: echo request (frag
> 18997:1480@0+)
> (ttl 64, len 1500)
> 192.168.135.213 > 195.69.108.254: icmp (frag 18997:528@1480) (ttl
> 64, len
> 548)
> 192.168.135.213 > 195.69.108.254: icmp: echo request (frag
> 19000:1480@0+)
> (ttl 64, len 1500)
> 192.168.135.213 > 195.69.108.254: icmp (frag 19000:528@1480) (ttl
> 64, len
> 548)
> 192.168.135.213 > 195.69.108.254: icmp: echo request (frag
> 19004:1480@0+)
> (ttl 64, len 1500)
> 192.168.135.213 > 195.69.108.254: icmp (frag 19004:528@1480) (ttl
> 64, len
> 548)
> 192.168.135.213 > 195.69.108.254: icmp: echo request (frag
> 19008:1480@0+)
> (ttl 64, len 1500)
> 192.168.135.213 > 195.69.108.254: icmp (frag 19008:528@1480) (ttl
> 64, len
> 548)
>
> Router-FreeBSD RELEASE-4.11-p13 with pipe's for incoming and outgoing
> traffic
>
> 192.168.135.213 > 195.69.108.254: icmp: echo request (frag
> 18997:1480@0+)
> 192.168.135.213 > 195.69.108.254: icmp (frag 18997:528@1480)
> 192.168.135.213 > 195.69.108.254: icmp: echo request (frag
> 19000:1480@0+)
> 192.168.135.213 > 195.69.108.254: icmp (frag 19000:528@1480)
> 192.168.135.213 > 195.69.108.254: icmp: echo request (frag
> 19004:1480@0+)
> 192.168.135.213 > 195.69.108.254: icmp (frag 19004:528@1480)
> 192.168.135.213 > 195.69.108.254: icmp: echo request (frag
> 19008:1480@0+)
> 192.168.135.213 > 195.69.108.254: icmp (frag 19008:528@1480)
>
>
> Router-FreeBSD RELEASE-5.4-p8 with pipe's for incoming and outgoing
> traffic
>
> IP (tos 0x0, ttl 62, id 26431, offset 0, flags [+], length: 1500)
> 192.168.135.213 > 195.69.108.254: icmp 1480: echo request seq 0
> IP (tos 0x0, ttl 62, id 26433, offset 1480, flags [none], length:
> 548)
> 192.168.135.213 > 195.69.108.254: icmp
> IP (tos 0x0, ttl 62, id 36602, offset 0, flags [+], length: 1500)
> 192.168.135.213 > 195.69.108.254: icmp 1480: echo request seq 256
> IP (tos 0x0, ttl 62, id 36603, offset 1480, flags [none], length:
> 548)
> 192.168.135.213 > 195.69.108.254: icmp
> IP (tos 0x0, ttl 62, id 46610, offset 0, flags [+], length: 1500)
> 192.168.135.213 > 195.69.108.254: icmp 1480: echo request seq 512
> IP (tos 0x0, ttl 62, id 46611, offset 1480, flags [none], length:
> 548)
> 192.168.135.213 > 195.69.108.254: icmp
> IP (tos 0x0, ttl 62, id 57038, offset 0, flags [+], length: 1500)
> 192.168.135.213 > 195.69.108.254: icmp 1480: echo request seq 768
> IP (tos 0x0, ttl 62, id 57039, offset 1480, flags [none], length:
> 548)
> 192.168.135.213 > 195.69.108.254: icmp
>
> the second router 5.x first change id off fragments then broke
> sequence and
> destination host can't reasseble all packet this is the reason why
> ping -s 2000 x.y.z.1 won't work
> traceroute x.y.z.1 2000
> tcptraceroute x.y.z.1 80 2000 too
> but it's a simple tools for troubleshooting , the baddest in this
> case is
> that it's harm real traffic vpn-s , and others
>
> ---> Here is a fix of this problem
>
>
> --- ip_output.c Fri Dec 2 13:35:16 2005
> +++ ip_output-fix.c Thu Dec 8 17:39:28 2005
> @@ -173,7 +173,6 @@
> if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
> ip->ip_v = IPVERSION;
> ip->ip_hl = hlen >> 2;
> - ip->ip_id = ip_newid();
> ipstat.ips_localout++;
> } else {
> hlen = ip->ip_hl << 2;
>
>
> br,
> CCNP Atanas Yankov
> Network Administrator
> AngelSoft Ltd.
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--
Alvaro Saurin <alvaro.saurin@gmail.com> <saurin@dcs.gla.ac.uk>
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