dnseval: displaying the IP TTL?

[webernetz]

Just another idea: Could you add a column to dnseval to display the TTL (hop limit) value of the IP packet? This could give some ideas on "how far" the DNS server is.
Well, since this is not a traceroute (which would display the hop count exactly), you can only display the received TTL. Since some servers start by 64 while others start by 256 (or any other value), only experts can use the provided information, such as "if it displays a 56 I suppose it is 8 hops aways", or the like.

What do you think about that?

[farrokhi]

The idea of guessing hop count to DNS server is interesting, but I am not sure if people expect to see IP TTL as the output of performance evaluation. Maybe there is a better way to do this.

Another question is that ( given dnseval sends multiple requests to each server) what if all TTLs are not equal due to routing issues in the path?

[webernetz]

The idea of guessing hop count to DNS server is interesting, but I am not sure if people expect to see IP TTL as the output of performance evaluation. Maybe there is a better way to do this.

Well, to my mind this is interesting. ;) For example: I have three name servers on the Internet but I am interested which one is "closest" to my current location. I am not only intereseted in time but also in hop counts.

Another question is that ( given dnseval sends multiple requests to each server) what if all TTLs are not equal due to routing issues in the path?

Yes, good question. Maybe answering with the range of all requests?

[farrokhi]

Note: I did a quick research on this and it seems we cannot set IP_RECVTTL in python out of the box.

[webernetz]

Ok, thanks for the info anyway.