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Re: ping packet loss when size gt 1500

Morgan Gangwere on 16/10/10 21:14, wrote:
On Sat, 16 Oct 2010 20:11:46 +0100 Adam Hardy <> wrote:


Nope you're not the only one:

( 4:~ )%ping -s 1473
PING ( 1473(1501) bytes of data.
^C --- ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3022ms

this also appears to violate the PING standard:

( 5:~ )%ping -s 1470

1470(1498) bytes of data. From icmp_seq=1 Frag needed and
DF set (mtu = 1492) ^C
--- ping statistics ---
7 packets transmitted, 0 received, +1 errors, 100% packet loss, time

Normal PINGs seem to be fine:

( 7:~ )%ping
PING ( 56(84) bytes of data. 64
bytes from icmp_req=1 ttl=118 time=150 ms 64 bytes from icmp_req=2 ttl=118 time=147 ms 64 bytes from icmp_req=3 ttl=118 time=149 ms 64 bytes from icmp_req=4 ttl=118 time=146 ms ^C
--- ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3001ms
rtt min/avg/max/mdev = 146.120/148.259/150.102/1.622 ms

The device has a DNS of mktgw1.ibllc.com \footnote{Isn't this sounding
like insecure.org now?} and doesn't respond to nmap's pings. I call
fault on their part.

Are you on a PPPoE connection directly or on a NAT'd network?

I'm on PPPoA connection using a DSL modem on one side of my gateway machine, and my LAN on the other side. The gateway uses iptables to connect up the LAN to the net so I believe that's what you mean by a NAT'd network.

What exactly is the violation of the ping standard there in your example?

The ideal solution would be that this firm recognises an error on their server and fixes it, but (a) I'd need to give them a cast iron error description and (b) I doubt they'd ever do anything anyway.

Actually I should search google for "ping interactivebrokers" and maybe there'll be some other people in this situation.


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