Originally posted by Lance
View Post
- Visitors can check out the Forum FAQ by clicking this link. You have to register before you can post: click the REGISTER link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. View our Forum Privacy Policy.
- Want to receive the latest contracting news and advice straight to your inbox? Sign up to the ContractorUK newsletter here. Every sign up will also be entered into a draw to WIN £100 Amazon vouchers!
Tracing an internet connection
Collapse
X
-
-
According to this, the <40ms average ping times I'm currently getting do appear to be at the limits of what is achievable with 4G.
https://www.4g.co.uk/news/4g-injecti...#Lower_latency
Hopefully, it continues like this.Comment
-
Originally posted by woody1 View PostAccording to this, the <40ms average ping times I'm currently getting do appear to be at the limits of what is achievable with 4G.
https://www.4g.co.uk/news/4g-injecti...#Lower_latency
Hopefully, it continues like this.
TCP/IP was designed to cope with packet loss and variable latencies. It's why you have TCP sliding windows. It's why you can have large bandwidths with high latency (the two are not directly related).
When using voice, jitter is a bigger problem than latency.
You youngsters have been spoiled. A reliable, low jitter, 2Mb/s connection is bloody amazing. I'd rather have that than a Talktalk 70Mb/s lossy, unreliable bag of sh1te.
If you want to learn some more read up about TCP sliding windows, and QoS. All QoS does is determine which packets get dropped in a congested network (it's nothing fancy, but is very effective).See You Next TuesdayComment
-
Originally posted by Lance View Post
latency isn't an issue unless you have particularly time sensitive apps. And even if you do, 250ms is generally considered acceptable for a worst case scenario.
BTW, I learned something new the other day; that you can deduce quite a lot from the TTL in the ping output.Comment
-
Originally posted by woody1 View Post
I'm only using latency (ping) as a measure of the health of the connection. I now know that 40ms is v.good.
BTW, I learned something new the other day; that you can deduce quite a lot from the TTL in the ping output.
I've seen some ISPs actually add numbers to the TTLSee You Next TuesdayComment
-
Originally posted by Lance View Post
only if you assume that every router decrements the TTL by 1. Which is a fair assumption on business LAN/WAN., but not on an internet provider who want their network obscure. If they block the ICMP response to stop you trace routing, why would they play nicely with the TTL?
I've seen some ISPs actually add numbers to the TTL
BTW, do you know if there is any way of discovering the IP addresses of the hops which appear as "* * *" in traceroute? Or would I need to consult a hacker for that?Last edited by woody1; 21 June 2023, 13:07.Comment
-
Originally posted by woody1 View Post
Yes I read this. But I also hadn't realised that the TTL varies depending on the OS of the target host.
BTW, do you know if there is any way of discovering the IP addresses of the hops which appear as "* * *" in traceroute? Or would I need to consult a hacker for that?
The TTL might be being decremented by more than one by a device. What will show as a 'missing' hop.
All you know is that the ICMP packet that was sent with a TTL for that hop number didn't get a response.
this explains it quite well Traceroute (networklessons.com)Last edited by Lance; 22 June 2023, 09:10.See You Next TuesdayComment
- Home
- News & Features
- First Timers
- IR35 / S660 / BN66
- Employee Benefit Trusts
- Agency Workers Regulations
- MSC Legislation
- Limited Companies
- Dividends
- Umbrella Company
- VAT / Flat Rate VAT
- Job News & Guides
- Money News & Guides
- Guide to Contracts
- Successful Contracting
- Contracting Overseas
- Contractor Calculators
- MVL
- Contractor Expenses
Advertisers
Contractor Services
CUK News
- Streamline Your Retirement with iSIPP: A Solution for Contractor Pensions Sep 1 09:13
- Making the most of pension lump sums: overview for contractors Sep 1 08:36
- Umbrella company tribunal cases are opening up; are your wages subject to unlawful deductions, too? Aug 31 08:38
- Contractors, relabelling 'labour' as 'services' to appear 'fully contracted out' won't dupe IR35 inspectors Aug 31 08:30
- How often does HMRC check tax returns? Aug 30 08:27
- Work-life balance as an IT contractor: 5 top tips from a tech recruiter Aug 30 08:20
- Autumn Statement 2023 tipped to prioritise mental health, in a boost for UK workplaces Aug 29 08:33
- Final reminder for contractors to respond to the umbrella consultation (closing today) Aug 29 08:09
- Top 5 most in demand cyber security contract roles Aug 25 08:38
- Changes to the right to request flexible working are incoming, but how will contractors be affected? Aug 24 08:25
Comment