GTT blocking IPv4 address 128.31.0.39

Wed Jan 4 03:49:17 UTC 2023

Hi,

I am a customer of ReliableSite in their New Jersey location, and RS 
uses GTT as a transit ISP, along with Tata and Comcast.

GTT appears to be blocking the IPv4 address 128.31.0.39, and RS' BGP 
uses GTT for 128.31.0.39.

neel at t1:~ % traceroute 128.31.0.39
traceroute to 128.31.0.39 (128.31.0.39), 64 hops max, 40 byte packets
  1  45.150.XXX.1 (45.150.XXX.1)  4.828 ms  4.557 ms  5.916 ms
  2  * * *
^C
neel at t1:~ %

Hop #2 which is generally the transit provider, GTT (which handles this 
route).

Note: 45.150.XXX.1 is because it's a subnet I brought in, this is the 
only ReliableSite hop.

The 128.31.0.0/24 doesn't appear to be blocked as a whole, only that 
128.31.0.39. See below:

neel at t1:~ % traceroute 128.31.0.1
traceroute to 128.31.0.1 (128.31.0.1), 64 hops max, 40 byte packets
  1  45.150.XXX.1 (45.150.XXX.1)  0.241 ms  0.220 ms  9.362 ms
  2  ae9-300.cr2-nyc4.ip4.gtt.net (209.120.147.121)  1.605 ms  0.853 ms  
1.173 ms
  3  ae3.cr1-nyc2.ip4.gtt.net (89.149.129.194)  5.488 ms  6.471 ms  1.451 
ms
  4  be3088.ccr31.jfk04.atlas.cogentco.com (154.54.11.57)  1.604 ms  
1.726 ms *
  5  be3363.ccr42.jfk02.atlas.cogentco.com (154.54.3.125)  1.802 ms  
1.771 ms  1.708 ms
  6  be3472.ccr32.bos01.atlas.cogentco.com (154.54.46.33)  7.082 ms  
7.268 ms  7.249 ms
  7  38.104.186.186 (38.104.186.186)  7.017 ms  7.247 ms  6.987 ms
  8  dmz-rtr-1-external-rtr-3.mit.edu (18.0.161.13)  7.010 ms  7.001 ms  
6.996 ms
  9  dmz-rtr-2-dmz-rtr-1-2.mit.edu (18.0.162.6)  7.033 ms  7.294 ms
     dmz-rtr-2-dmz-rtr-1-1.mit.edu (18.0.161.6)  7.073 ms
10  guest.default.csail.mit.edu (128.31.0.1)  9.011 ms  7.484 ms  7.551 
ms
neel at t1:~ %

As you can see here, GTT handles other 128.31.0.39 IPs fine as seen in 
hop #2.

ReliableSite says they don't block the IP address, but I don't have any 
contact at GTT or MIT.

My home ISP, Lumen/CenturyLink/Level 3 does not block 128.31.0.39.

128.31.0.39 is a Tor directory authority IP, which is usually a 
phonebook of Tor relays. There are 9 in the world and the other 8 are 
unblocked from ReliableSite.

Yes, I know Tor is all this 'bad stuff' but the reality is that 99% of 
Tor users use it like a VPN, speaking as a Tor exit operator and code 
contributor myself. Exit abuse complaints were super common 5-8 years 
ago but are now super rare.

If someone works at GTT, can 128.31.0.39 be unblocked?

Best,

-Neel

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