[Rack] robot IP address still not working

Jonathan Lassoff jof at thejof.com
Wed May 9 20:20:56 PDT 2012


Looks like that caused them to re-poll.

Still futzing with iptables...

On Wed, May 9, 2012 at 7:58 PM, Jonathan Lassoff <jof at thejof.com> wrote:

> On Wed, May 9, 2012 at 7:48 PM, Jonathan Lassoff <jof at thejof.com> wrote:
>
>> It's the oddest thing with bikeshed...
>>
>> I'm trying to do some DNAT for traffic coming inbound, and I can see the
>> traffic with I pcap the interface, but if I add a logging statement in
>> raw/PREROUTING matching on just the external destination IP and having it
>> LOG... it never logs from a remote source.
>>
>> However, it works from another external IP in the same external LAN
>> (minotaur -> MC Hawking external IP).
>>
>>
>> The only thing I can think of as blocking this from getting from there to
>> there is ebtables filtering, but there's no ebtables binary available.
>> Maybe something else it setting stuff in there with it's own binary
>> support for the right netlink messages.
>>
>> Any ideas?
>>
>
> Actually, I may have figured it out. Sonic.net seems to have somehow
> learned the address 52:54:00:2a:80:90 for 75.101.62.93:
>
> 02:52:27.348405 00:22:be:3c:d6:44 > 52:54:00:2a:80:90, ethertype IPv4
> (0x0800), length 78: REMOTE_IP_SCRUBBED.PORT > 75.101.62.93.22: Flags [S],
> seq xxxxxxxxxx, win 65535, options [mss 1460,nop,wscale 3,nop,nop,TS val
> 30107305 ecr 0,sackOK,eol], length 0
>
> But locally, hosts are learning the right MAC:
>
>
> .-(~)--------------------------------------------------------------------------------------------------(jof at minotaur
> )-
> `--> sudo arping -I eth0 75.101.62.93
> ARPING 75.101.62.93 from 75.101.62.92 eth0
> Unicast reply from 75.101.62.93 [00:00:24:C8:DF:FE]  0.835ms
> Unicast reply from 75.101.62.93 [00:00:24:C8:DF:FE]  0.832ms
> ^CSent 2 probes (1 broadcast(s))
> Received 2 response(s)
>
> root at bikeshed:~# ifconfig eth2
> eth2      Link encap:Ethernet  HWaddr 00:00:24:c8:df:fe
>           inet addr:75.101.62.88  Bcast:75.101.62.255  Mask:255.255.255.0
>           inet6 addr: fe80::200:24ff:fec8:dffe/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:115779121 errors:0 dropped:16042396 overruns:0 frame:0
>           TX packets:71834438 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:3468915913 (3.2 GiB)  TX bytes:4157264755 (3.8 GiB)
>           Interrupt:9 Base address:0xe300
>
>
> Let's see if they accept gratuitous ARPs.
>
>
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