Re: [gentoo-user] {OT} ISP requires MTU below 1500?

On Tue Sep 20 07:52:58 2016, Todd Goodman wrote: > MTU is per network interface but you really don't want to end up having > your router fragment every IP packet because systems on your subnet are > using a larger MTU. > > Todd You will not fragment every packet, the PMTUd will do his job and

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

On Tuesday 20 Sep 2016 12:57:00 Grant wrote: > > Leaving your MTU at the default ethernet size of 1500 on your PC/server > > should not cause a problem for most day to day operations, because modern > > end-point OS and network devices use Path MTU Detection. Problems will > > arise when you come

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

> Leaving your MTU at the default ethernet size of 1500 on your PC/server should > not cause a problem for most day to day operations, because modern end-point > OS and network devices use Path MTU Detection. Problems will arise when you > come across a misconfigured router/firewall/server

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

On Tuesday 20 Sep 2016 19:38:02 David Haller wrote: > Hello, > > On Tue, 20 Sep 2016, Grant wrote: > >>>Strangely, I'm able to ping with that command even with a very high -s > >>>value: > >>> > >>>$ ping -c 4 -M dont -s www.dslreports.com > >>>PING www.dslreports.com (64.91.255.98)

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

Hello, On Tue, 20 Sep 2016, Grant wrote: >>>Strangely, I'm able to ping with that command even with a very high -s value: >>> >>>$ ping -c 4 -M dont -s www.dslreports.com >>>PING www.dslreports.com (64.91.255.98) (10027) bytes of data. >>>10007 bytes from www.dslreports.com

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

>>Strangely, I'm able to ping with that command even with a very high -s value: >> >>$ ping -c 4 -M dont -s www.dslreports.com >>PING www.dslreports.com (64.91.255.98) (10027) bytes of data. >>10007 bytes from www.dslreports.com (64.91.255.98): icmp_seq=1 ttl=54 >>time=331 ms >>10007

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

Hello, On Tue, 20 Sep 2016, Grant wrote: [..] >> $ ping -n -c 1 -M dont -s 1465 www.dslreports.com >> PING www.dslreports.com (64.91.255.98) 1465(1493) bytes of data. >> 1473 bytes from 64.91.255.98: icmp_seq=1 ttl=51 time=137 ms >> >> 1 packets transmitted, 1 received, 0% packet loss, time 0ms

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

>>> MTU is per network interface but you really don't want to end up having >>> your router fragment every IP packet because systems on your subnet are >>> using a larger MTU. >>> >>> Todd >> >>That makes sense. So in my case, I'm thinking 1492 MTU on every >>interface in the network. >> >>So I'm

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

Hello, On Tue, 20 Sep 2016, Grant wrote: >> MTU is per network interface but you really don't want to end up having >> your router fragment every IP packet because systems on your subnet are >> using a larger MTU. >> >> Todd > >That makes sense. So in my case, I'm thinking 1492 MTU on every

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

* Grant [160920 08:53]: > >> > A while back I was having networking issues. I eventually tried > >> > drastically lowering the MTU of all the systems onsite and the issues > >> > disappeared. I always thought the issue was due to the MTU on our > >> > modem/router. Today

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

>> > A while back I was having networking issues. I eventually tried >> > drastically lowering the MTU of all the systems onsite and the issues >> > disappeared. I always thought the issue was due to the MTU on our >> > modem/router. Today I read that AT DSL requires a 1492 MTU so I >> >

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

>> Rather than guess and take random values read on the net - measure it. >> >> Google calculate mtu - netgear and others show ways to test upstream to >> get the ideal size using ping >> >> You are looking for the largest MTU value before fragmentation starts to >> occur. > > See

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

* wabe [160919 20:50]: > Grant wrote: > > > A while back I was having networking issues. I eventually tried > > drastically lowering the MTU of all the systems onsite and the issues > > disappeared. I always thought the issue was due to the MTU on our

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

On Tue, Sep 20, 2016 at 11:34:32AM +0800, Bill Kenworthy wrote > > Rather than guess and take random values read on the net - measure it. > > Google calculate mtu - netgear and others show ways to test upstream to > get the ideal size using ping > > You are looking for the largest MTU value

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

On 09/20/16 10:35, wabe wrote: > Grant wrote: > A while back I was having networking issues. I eventually tried drastically lowering the MTU of all the systems onsite and the issues disappeared. I always thought the issue was due to the MTU on our

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

Grant wrote: > >> A while back I was having networking issues. I eventually tried > >> drastically lowering the MTU of all the systems onsite and the > >> issues disappeared. I always thought the issue was due to the MTU > >> on our modem/router. Today I read that AT DSL

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

>> A while back I was having networking issues. I eventually tried >> drastically lowering the MTU of all the systems onsite and the issues >> disappeared. I always thought the issue was due to the MTU on our >> modem/router. Today I read that AT DSL requires a 1492 MTU so I >> increased the

Re: [gentoo-user] {OT} ISP requires MTU below 1500?

Grant wrote: > A while back I was having networking issues. I eventually tried > drastically lowering the MTU of all the systems onsite and the issues > disappeared. I always thought the issue was due to the MTU on our > modem/router. Today I read that AT DSL requires a