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| zerobaud | is it impossible to have GRE over a 1500 MTU without the encapsulated L2 frames being less then 1500?What if I write a server that takes raw GRE input and transfers it over L3 over TCP, it will get chopped up and arrive just fine... why is there no easy solution? My requirement is that the MTU of traffic within the tunnel stays 1500 and for the | 10:32 |
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| zerobaud | link of the tunnel also 1500, and I do not want to rely on ICMP or MTU discovery. | 10:32 |
| zerobaud | any other tunnel protocol is fine as long as it allows me to send traffic | 10:32 |
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| bern | hi all, I'm wondering if I'm going a little mad. Have set up a new aarch64 RPi4 box running Fedora 32, just upgraded to openvswitch 2.13.0 (but the problem existed in 2.12.0 too) | 14:05 |
| bern | I've got a VLAN internal port hanging off an ova bridge, I can ping across it, and UDP appears to work but TCP isn't working. | 14:06 |
| bern | new box sends out a SYN, tcpdump sees the SYN|ACK response, but no ACK goes out | 14:06 |
| bern | the other way around, no SYN|ACK is sent | 14:07 |
| bern | I've eliminated the firewall, the box isn't (yet) routing, I've installed frr on it and its neighbour on the VLAN and I noticed the TCP problem when I couldn't get BGP to come up | 14:09 |
| bern | with OSPF (which uses UDP) I get a full adjacency | 14:09 |
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| bern | going to be afk for a bit, will try to keep this connection online as long as I can, would love to hear if anyone can point me somewhere with my issue. | 14:32 |
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| bern | Hi again, wondering if my question a few hours ago made sense. What would cause UDP to work, but not TCP, to an IP address on a VLAN internal port? | 19:23 |
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| inflatador | hey bern, I'm available for wild speculation but I don't have a great answer for you. I'd look at packet size and maybe TCP flags? | 21:00 |
| bern | thanks for thinking! be as wild as you like. Now I'm happy with MTU (as OSPF adjacencies demand a match) and I can ping 1500-byte packets with DF set | 21:07 |
| bern | for TCP flags, the right packets hit my F32 RPi4 running ovs, but it doesn't emit the ACK or SYN|ACK packets it's supposed to | 21:08 |
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| bern | (the other end is an RPi3 running Raspbian armv7l 32-bit with old school brctl / vconfig. It is behaving properly.) | 21:13 |
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