Bsnl

It’s late night here in India. I am having final 8th semester exams and as usual really bored! 

Though this time we have interesting subjects but still syllabus is pretty boring spreading across multiple books, notes and pdf’s. Anyways I will be out of college after June which sounds good.

Tonight, I found a routing glitch. Yes a routing glitch!! :)

These issues somehow keep my life in orbit and give a good understanding on how routing works over the Internet.

Just was looking at routing tables of BSNL. They have a significant address space in /10 - 117.192.0.0/10. Overall this /10 address space is divided into /18 and /20 subnets.

Let’s pick two of such subnets and observe routing tables from route-views:

1. 117.192.0.0/18
2. 117.192.0.0/20 

Routing table for 117.192.0.0/18: 

* 117.192.0.0/18 193.0.0.56 0 3333 3356 6453 4755 9829 9829 9829 i  
* 194.85.102.33 0 3277 3216 6453 4755 9829 9829 9829 i  
* 194.85.40.15 0 3267 174 6453 4755 9829 9829 9829 i  
* 129.250.0.11 6 0 2914 6453 6453 4755 9829 9829 9829 i  
* 128.223.253.10 0 3582 3701 3356 6453 4755 9829 9829 9829 i  
* 4.69.184.193 0 0 3356 6453 4755 9829 9829 9829 i  
* 209.124.176.223 0 101 101 3356 6453 4755 9829 9829 9829 i  
* 69.31.111.244 3 0 4436 2914 6453 6453 4755 9829 9829 9829 i  
* 207.46.32.34 0 8075 6453 4755 9829 9829 9829 i  
* 66.59.190.221 0 6539 6453 4755 9829 9829 9829 i  
* 12.0.1.63 0 7018 6453 4755 9829 9829 9829 i  
* 208.74.64.40 0 19214 2828 6453 4755 9829 9829 9829 i  
* 203.181.248.168 0 7660 2516 6453 4755 9829 9829 9829 i  
* 66.185.128.48 111 0 1668 6453 4755 9829 9829 9829 i  
* 134.222.87.1 0 286 6453 4755 9829 9829 9829 i  
* 157.130.10.233 0 701 6453 4755 9829 9829 9829 i  
* 114.31.199.1 0 0 4826 6939 1299 6453 4755 9829 9829 9829 i  
* 89.149.178.10 10 0 3257 6453 4755 9829 9829 9829 i  
* 154.11.98.225 0 0 852 3561 6453 4755 9829 9829 9829 i  
* 202.249.2.86 0 7500 2497 6453 4755 9829 9829 9829 i  
* 154.11.11.113 0 0 852 3561 6453 4755 9829 9829 9829 i  
* 144.228.241.130 0 1239 6453 4755 9829 9829 9829 i  
* 217.75.96.60 0 0 16150 1299 6453 4755 9829 9829 9829 i  
* 207.172.6.20 0 0 6079 3356 6453 4755 9829 9829 9829 i  
* 206.24.210.102 0 3561 6453 4755 9829 9829 9829 i  
* 195.66.232.239 0 5459 6453 4755 9829 9829 9829 i  
* 208.51.134.254 2523 0 3549 6453 4755 9829 9829 9829 i  
* 207.172.6.1 0 0 6079 3356 6453 4755 9829 9829 9829 i  
* 216.218.252.164 0 6939 1299 6453 4755 9829 9829 9829 i  
* 203.62.252.186 0 1221 4637 6453 4755 9829 9829 9829 i  
*> 66.110.0.86 0 6453 4755 9829 9829 9829 i  
* 164.128.32.11 0 3303 6453 4755 9829 9829 9829 i  
* 202.232.0.2 0 2497 6453 4755 9829 9829 9829 i

Routing table for 117.192.0.0/20:

Finally back in village location.

Was just looking around and saw BSNL having really crazy routing. I looked around and saw this:

NIXI Looking Glass - show ip bgp neighbors 218.100.48.15 routes

Router: NIXI Delhi (Noida)

Command: show ip bgp neighbors 218.100.48.15 routes

Total number of prefixes 0

Clearly BSNL is NOT announcing any prefix at NIXI Delhi at all. Thus if one has to send packets to BSNL in North area either it will be via transit (Tata/VSNL) or via any other peering NIXI exchange in Mumbai or Chennai.

An interesting evening here in village. From today sessional tests started at college and so does my blog posts too (to keep myself with positive energy!) ;)

 

Learned something new while troubleshooting. :)

I am used to getting latency of ~350ms with my server in Europe as I have mentioned in my past blog posts.

My connection > Server goes direct but return path goes via US and this is what increases latency. Today all of sudden I saw latency of 200ms with my server. 150ms less - that’s significant.

These days Open DNS resolvers are getting quite popular. With Open DNS resolver I mean resolvers including OpenDNS as well as Google Public DNS.

One of major issues these resolvers suffer is failure of integration with CDN providers like Akamai, Limelight etc. In this post I will analyse sample client site of Akamai - Malaysia Airlines website - http://www.malaysiaairlines.com.  

Looking at OpenDNS, Google Public DNS and my ISP (BSNL’s) DNS resolver for its DNS records: