On Fri, 1 May 2020 at 19:00, Dovid Bender <dovid@telecurve.com> wrote:
I currently have an airlink that is connected directly to a raritan console server. The public IP sits on the raritan. The airlink does not seem to have any MTU options. Ideally I would change the MTU on the interface of the LTE modem wich would force the raritan to send all data < 1400 bytes per packet. I never thought about the reverse so we may need something that would tinker with the MSS as well.
Exactly my use-case with ISR4331 + async NIM + 4G NIM (1RU, single integrated power supply). Call home over 4G with unspecified WAN IP with IPSEC. interface Tunnel1 description OM: OOB IPsec DMVPN - local wire out-of-band ip address 100.100.1.18 255.255.255.0 no ip redirects no ip proxy-arp ip nhrp map 100.100.1.1 x.y.163.1 ip nhrp map 100.100.1.2 x.y.164.1 ip nhrp network-id 1 ip nhrp holdtime 300 ip nhrp nhs 100.100.1.1 ip nhrp nhs 100.100.1.2 ip route-cache same-interface ip tcp adjust-mss 1350 load-interval 30 keepalive 10 3 tunnel source Cellular0/2/0 tunnel mode gre multipoint tunnel key 1 tunnel protection ipsec profile OOB hold-queue 3584 in ! !interface Cellular0/2/0 description OM: WAN out-of-band - SINGTEL SIM X ip address negotiated no ip redirects no ip proxy-arp ip access-group FROM:INTERNET in load-interval 30 dialer in-band dialer idle-timeout 0 dialer watch-group 1 no ipv6 nd ra suppress hold-queue 3584 in ! controller Cellular 0/2/0 lte modem link-recovery rssi onset-threshold -110 lte modem link-recovery monitor-timer 20 lte modem link-recovery wait-timer 10 lte modem link-recovery debounce-count 6 -- ++ytti