Networking

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.

Back in India after amazing APRICOT 2013 at Singapore. It was nice to stay in East Asia for a while and look around. :)

Anyways, issue for today - I have been using Airtel DNS servers from quite sometime since BSNL has crappy DNS while Google gives issues with Akamai while OpenDNS doesn’t has any node in India yet.  

Today I noticed a NXDOMAIN redirection for a non-working domain and later investigated. It seems like Airtel is hijacking on NXDOMAIN queries now.

A quick blog post on a interesting issue coming up due to combined problem of CDN failure on Google Public DNS and bad Akamai performance due to Tata-NTT peering issue.

I was trying Zembra mail since there’s no more free Google Apps edition and one of my friend asked me to basic email on his domain up. It was more or less a straight task by installing Zembra with decent GUI.

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.